31021402036 has 24 divisors (see below), whose sum is σ = 54682874120. Its totient is φ = 15397903872.

The previous prime is 31021402019. The next prime is 31021402039. The reversal of 31021402036 is 63020412013.

It can be written as a sum of positive squares in 4 ways, for example, as 20757136 + 31000644900 = 4556^2 + 176070^2 .

It is a super-3 number, since 3×31021402036³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31021401998 and 31021402016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31021402039) 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, 687136 + ... + 730888.

Almost surely, 2^31021402036 is an apocalyptic number.

It is an amenable number.

31021402036 is a deficient number, since it is larger than the sum of its proper divisors (23661472084).

31021402036 is a wasteful number, since it uses less digits than its factorization.

31021402036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45043 (or 45041 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 31021402036 its reverse (63020412013), we get a palindrome (94041814049).

The spelling of 31021402036 in words is "thirty-one billion, twenty-one million, four hundred two thousand, thirty-six".