31550142100420 has 24 divisors (see below), whose sum is σ = 66255551107200. Its totient is φ = 12620008707552.

The previous prime is 31550142100349. The next prime is 31550142100429. The reversal of 31550142100420 is 2400124105513.

It is a super-2 number, since 2×31550142100420² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31550142100429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2623861 + ... + 8365699.

It is an arithmetic number, because the mean of its divisors is an integer number (2760647962800).

Almost surely, 2^{31550142100420} is an apocalyptic number.

It is an amenable number.

31550142100420 is an abundant number, since it is smaller than the sum of its proper divisors (34705409006780).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31550142100420 is a wasteful number, since it uses less digits than its factorization.

31550142100420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6016587 (or 6016585 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 31550142100420 its reverse (2400124105513), we get a palindrome (33950266205933).

The spelling of 31550142100420 in words is "thirty-one trillion, five hundred fifty billion, one hundred forty-two million, one hundred thousand, four hundred twenty".