31261421153421 has 24 divisors (see below), whose sum is σ = 45603210941496. Its totient is φ = 20634265766400.

The previous prime is 31261421153399. The next prime is 31261421153461. The reversal of 31261421153421 is 12435112416213.

31261421153421 is a `hidden beast` number, since 3 + 1 + 2 + 6 + 14 + 211 + 5 + 3 + 421 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 3060701264196 + 28200719889225 = 1749486^2 + 5310435^2 .

It is not a de Polignac number, because 31261421153421 - 2¹⁸ = 31261420891277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31261421153461) 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, 63669961 + ... + 64159073.

It is an arithmetic number, because the mean of its divisors is an integer number (1900133789229).

Almost surely, 2^{31261421153421} is an apocalyptic number.

It is an amenable number.

31261421153421 is a deficient number, since it is larger than the sum of its proper divisors (14341789788075).

31261421153421 is a wasteful number, since it uses less digits than its factorization.

31261421153421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559533 (or 559530 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

Adding to 31261421153421 its reverse (12435112416213), we get a palindrome (43696533569634).

The spelling of 31261421153421 in words is "thirty-one trillion, two hundred sixty-one billion, four hundred twenty-one million, one hundred fifty-three thousand, four hundred twenty-one".