21102021000121 has 4 divisors (see below), whose sum is σ = 21102589227600. Its totient is φ = 21101452772644.

The previous prime is 21102021000043. The next prime is 21102021000143. The reversal of 21102021000121 is 12100012020112.

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 21102021000121 - 2²¹ = 21102018902969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21102021000191) 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, 284058031 + ... + 284132308.

It is an arithmetic number, because the mean of its divisors is an integer number (5275647306900).

Almost surely, 2^{21102021000121} is an apocalyptic number.

It is an amenable number.

21102021000121 is a deficient number, since it is larger than the sum of its proper divisors (568227479).

21102021000121 is an equidigital number, since it uses as much as digits as its factorization.

21102021000121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 568227478.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21102021000121 its reverse (12100012020112), we get a palindrome (33202033020233).

The spelling of 21102021000121 in words is "twenty-one trillion, one hundred two billion, twenty-one million, one hundred twenty-one", and thus it is an aban number.