21221233420121 has 48 divisors (see below), whose sum is σ = 25460300972160. Its totient is φ = 17628145920000.

The previous prime is 21221233420043. The next prime is 21221233420139. The reversal of 21221233420121 is 12102433212212.

It is not a de Polignac number, because 21221233420121 - 2¹⁴ = 21221233403737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21221233450121) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 339731390 + ... + 339793848.

It is an arithmetic number, because the mean of its divisors is an integer number (530422936920).

Almost surely, 2^{21221233420121} is an apocalyptic number.

It is an amenable number.

21221233420121 is a deficient number, since it is larger than the sum of its proper divisors (4239067552039).

21221233420121 is a wasteful number, since it uses less digits than its factorization.

21221233420121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64206 (or 64199 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

Adding to 21221233420121 its reverse (12102433212212), we get a palindrome (33323666632333).

The spelling of 21221233420121 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred thirty-three million, four hundred twenty thousand, one hundred twenty-one".