100568900021 has 2 divisors, whose sum is σ = 100568900022. Its totient is φ = 100568900020.

The previous prime is 100568900009. The next prime is 100568900063. The reversal of 100568900021 is 120009865001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85071388900 + 15497511121 = 291670^2 + 124489^2 .

It is a cyclic number.

It is not a de Polignac number, because 100568900021 - 2⁶ = 100568899957 is a prime.

It is a super-2 number, since 2×100568900021² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100568908021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50284450010 + 50284450011.

It is an arithmetic number, because the mean of its divisors is an integer number (50284450011).

Almost surely, 2^100568900021 is an apocalyptic number.

It is an amenable number.

100568900021 is a deficient number, since it is larger than the sum of its proper divisors (1).

100568900021 is an equidigital number, since it uses as much as digits as its factorization.

100568900021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 32.

The spelling of 100568900021 in words is "one hundred billion, five hundred sixty-eight million, nine hundred thousand, twenty-one".