31400020421 has 12 divisors (see below), whose sum is σ = 39444654816. Its totient is φ = 24467547720.

The previous prime is 31400020409. The next prime is 31400020441. The reversal of 31400020421 is 12402000413.

It is a de Polignac number, because none of the positive numbers 2^k-31400020421 is a prime.

It is a super-2 number, since 2×31400020421² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31400020421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31400020441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18535175 + ... + 18536868.

It is an arithmetic number, because the mean of its divisors is an integer number (3287054568).

Almost surely, 2^31400020421 is an apocalyptic number.

It is an amenable number.

31400020421 is a deficient number, since it is larger than the sum of its proper divisors (8044634395).

31400020421 is a wasteful number, since it uses less digits than its factorization.

31400020421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37072072 (or 37072061 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 31400020421 its reverse (12402000413), we get a palindrome (43802020834).

The spelling of 31400020421 in words is "thirty-one billion, four hundred million, twenty thousand, four hundred twenty-one".