101021000021 has 8 divisors (see below), whose sum is σ = 102090713088. Its totient is φ = 99952650000.

The previous prime is 101020999999. The next prime is 101021000023. The reversal of 101021000021 is 120000120101.

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 101021000021 - 2⁶ = 101020999957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101020999972 and 101021000008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101021000023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 191405 + ... + 488546.

It is an arithmetic number, because the mean of its divisors is an integer number (12761339136).

Almost surely, 2^101021000021 is an apocalyptic number.

It is an amenable number.

101021000021 is a deficient number, since it is larger than the sum of its proper divisors (1069713067).

101021000021 is a wasteful number, since it uses less digits than its factorization.

101021000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681523.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 101021000021 its reverse (120000120101), we get a palindrome (221021120122).

The spelling of 101021000021 in words is "one hundred one billion, twenty-one million, twenty-one", and thus it is an aban number.