21121431233121 has 48 divisors (see below), whose sum is σ = 31784732362240. Its totient is φ = 13500473472000.

The previous prime is 21121431233117. The next prime is 21121431233129. The reversal of 21121431233121 is 12133213412112.

21121431233121 is a `hidden beast` number, since 2 + 1 + 1 + 2 + 14 + 312 + 331 + 2 + 1 = 666.

It is not a de Polignac number, because 21121431233121 - 2² = 21121431233117 is a prime.

It is a super-2 number, since 2×21121431233121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21121431233129) 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, 423326586 + ... + 423376476.

Almost surely, 2^{21121431233121} is an apocalyptic number.

It is an amenable number.

21121431233121 is a deficient number, since it is larger than the sum of its proper divisors (10663301129119).

21121431233121 is a wasteful number, since it uses less digits than its factorization.

21121431233121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63958 (or 63955 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

Adding to 21121431233121 its reverse (12133213412112), we get a palindrome (33254644645233).

The spelling of 21121431233121 in words is "twenty-one trillion, one hundred twenty-one billion, four hundred thirty-one million, two hundred thirty-three thousand, one hundred twenty-one".