21121010022021 has 64 divisors (see below), whose sum is σ = 35390697914880. Its totient is φ = 10906835696640.

The previous prime is 21121010021959. The next prime is 21121010022053. The reversal of 21121010022021 is 12022001012112.

It is not a de Polignac number, because 21121010022021 - 2¹⁰ = 21121010020997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121010022121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5086975 + ... + 8253443.

It is an arithmetic number, because the mean of its divisors is an integer number (552979654920).

Almost surely, 2^{21121010022021} is an apocalyptic number.

21121010022021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21121010022021 is a deficient number, since it is larger than the sum of its proper divisors (14269687892859).

21121010022021 is a wasteful number, since it uses less digits than its factorization.

21121010022021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3167006.

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

Adding to 21121010022021 its reverse (12022001012112), we get a palindrome (33143011034133).

Subtracting from 21121010022021 its reverse (12022001012112), we obtain a palindrome (9099009009909).

The spelling of 21121010022021 in words is "twenty-one trillion, one hundred twenty-one billion, ten million, twenty-two thousand, twenty-one".