21122100012021 has 24 divisors (see below), whose sum is σ = 28668723518400. Its totient is φ = 13832827909824.

The previous prime is 21122100012019. The next prime is 21122100012053. The reversal of 21122100012021 is 12021000122112.

It is not a de Polignac number, because 21122100012021 - 2¹ = 21122100012019 is a prime.

It is a super-2 number, since 2×21122100012021² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122100012001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13886881 + ... + 15332633.

It is an arithmetic number, because the mean of its divisors is an integer number (1194530146600).

Almost surely, 2^{21122100012021} is an apocalyptic number.

It is an amenable number.

21122100012021 is a deficient number, since it is larger than the sum of its proper divisors (7546623506379).

21122100012021 is a wasteful number, since it uses less digits than its factorization.

21122100012021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1447273 (or 1447214 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21122100012021 its reverse (12021000122112), we get a palindrome (33143100134133).

The spelling of 21122100012021 in words is "twenty-one trillion, one hundred twenty-two billion, one hundred million, twelve thousand, twenty-one".