912100100021 has 4 divisors (see below), whose sum is σ = 995018290944. Its totient is φ = 829181909100.

The previous prime is 912100099991. The next prime is 912100100039. The reversal of 912100100021 is 120001001219.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 912100100021 - 2¹⁸ = 912099837877 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 (912100100521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41459095445 + ... + 41459095466.

It is an arithmetic number, because the mean of its divisors is an integer number (248754572736).

Almost surely, 2^912100100021 is an apocalyptic number.

It is an amenable number.

912100100021 is a deficient number, since it is larger than the sum of its proper divisors (82918190923).

912100100021 is a wasteful number, since it uses less digits than its factorization.

912100100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82918190922.

The product of its (nonzero) digits is 36, while the sum is 17.

The spelling of 912100100021 in words is "nine hundred twelve billion, one hundred million, one hundred thousand, twenty-one".