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101000021 = 678571759
BaseRepresentation
bin1100000010100…
…10001101010101
321001001022222112
412001102031111
5201324000041
614004440405
72334325463
oct601221525
9231038875
10101000021
11520148a1
12299a9105
1317c03a35
14d5b1833
158d00deb
hex6052355

101000021 has 8 divisors (see below), whose sum is σ = 102685440. Its totient is φ = 99319968.

The previous prime is 100999993. The next prime is 101000023. The reversal of 101000021 is 120000101.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 101000021 - 214 = 100983637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100999969 and 101000014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101000023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56540 + ... + 58298.

It is an arithmetic number, because the mean of its divisors is an integer number (12835680).

Almost surely, 2101000021 is an apocalyptic number.

It is an amenable number.

101000021 is a deficient number, since it is larger than the sum of its proper divisors (1685419).

101000021 is an equidigital number, since it uses as much as digits as its factorization.

101000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2683.

The product of its (nonzero) digits is 2, while the sum is 5.

The square root of 101000021 is about 10049.8766659099. The cubic root of 101000021 is about 465.7009830567.

Adding to 101000021 its reverse (120000101), we get a palindrome (221000122).

The spelling of 101000021 in words is "one hundred one million, twenty-one", and thus it is an aban number.

Divisors: 1 67 857 1759 57419 117853 1507463 101000021