31621224036 has 24 divisors (see below), whose sum is σ = 73988389440. Its totient is φ = 10511046112.

The previous prime is 31621224013. The next prime is 31621224071. The reversal of 31621224036 is 63042212613.

It is a junction number, because it is equal to n+sod(n) for n = 31621223994 and 31621224012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3665751 + ... + 3674366.

It is an arithmetic number, because the mean of its divisors is an integer number (3082849560).

Almost surely, 2^31621224036 is an apocalyptic number.

It is an amenable number.

31621224036 is an abundant number, since it is smaller than the sum of its proper divisors (42367165404).

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

31621224036 is a wasteful number, since it uses less digits than its factorization.

31621224036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7340483 (or 7340481 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

Adding to 31621224036 its reverse (63042212613), we get a palindrome (94663436649).

The spelling of 31621224036 in words is "thirty-one billion, six hundred twenty-one million, two hundred twenty-four thousand, thirty-six".