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100000021 = 11192371293
BaseRepresentation
bin1011111010111…
…10000100010101
320222011112020111
411331132010111
5201100000041
613531203021
72322662152
oct575360425
9228145214
10100000021
11514a1550
12295a6471
1317943814
14d3d1229
158ba4981
hex5f5e115

100000021 has 32 divisors (see below), whose sum is σ = 121927680. Its totient is φ = 80942400.

The previous prime is 100000007. The next prime is 100000037. The reversal of 100000021 is 120000001.

It is not a de Polignac number, because 100000021 - 25 = 99999989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100000081) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 341151 + ... + 341443.

It is an arithmetic number, because the mean of its divisors is an integer number (3810240).

Almost surely, 2100000021 is an apocalyptic number.

100000021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

100000021 is a deficient number, since it is larger than the sum of its proper divisors (21927659).

100000021 is a wasteful number, since it uses less digits than its factorization.

100000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417.

The product of its (nonzero) digits is 2, while the sum is 4.

The square root of 100000021 is about 10000.0010499999. The cubic root of 100000021 is about 464.1589158524.

Adding to 100000021 its reverse (120000001), we get a palindrome (220000022).

The spelling of 100000021 in words is "one hundred million, twenty-one", and thus it is an aban number.

Divisors: 1 11 19 23 71 209 253 293 437 781 1349 1633 3223 4807 5567 6739 14839 17963 20803 31027 61237 74129 128041 228833 341297 395257 478469 1408451 4347827 5263159 9090911 100000021