31121220210332 has 72 divisors (see below), whose sum is σ = 66789961658784. Its totient is φ = 12626243739648.

The previous prime is 31121220210277. The next prime is 31121220210349. The reversal of 31121220210332 is 23301202212113.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a junction number, because it is equal to n+sod(n) for n = 31121220210298 and 31121220210307.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35148053 + ... + 36022604.

It is an arithmetic number, because the mean of its divisors is an integer number (927638356372).

Almost surely, 2^{31121220210332} is an apocalyptic number.

It is an amenable number.

31121220210332 is an abundant number, since it is smaller than the sum of its proper divisors (35668741448452).

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

31121220210332 is a wasteful number, since it uses less digits than its factorization.

31121220210332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71170795 (or 71170786 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 31121220210332 its reverse (23301202212113), we get a palindrome (54422422422445).

The spelling of 31121220210332 in words is "thirty-one trillion, one hundred twenty-one billion, two hundred twenty million, two hundred ten thousand, three hundred thirty-two".