100121012000021 has 4 divisors (see below), whose sum is σ = 100122444190944. Its totient is φ = 100119579809100.

The previous prime is 100121011999919. The next prime is 100121012000059. The reversal of 100121012000021 is 120000210121001.

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 100121012000021 - 2³⁴ = 100103832130837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100121011999966 and 100121012000011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100121012003021) 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, 715990595 + ... + 716130416.

It is an arithmetic number, because the mean of its divisors is an integer number (25030611047736).

Almost surely, 2^{100121012000021} is an apocalyptic number.

It is an amenable number.

100121012000021 is a deficient number, since it is larger than the sum of its proper divisors (1432190923).

100121012000021 is an equidigital number, since it uses as much as digits as its factorization.

100121012000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1432190922.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 100121012000021 its reverse (120000210121001), we get a palindrome (220121222121022).

The spelling of 100121012000021 in words is "one hundred trillion, one hundred twenty-one billion, twelve million, twenty-one", and thus it is an aban number.