31213120021210 has 64 divisors (see below), whose sum is σ = 61270357737600. Its totient is φ = 11403392861952.

The previous prime is 31213120021177. The next prime is 31213120021231. The reversal of 31213120021210 is 1212002131213.

It is a super-2 number, since 2×31213120021210² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 453492 + ... + 7914031.

It is an arithmetic number, because the mean of its divisors is an integer number (957349339650).

Almost surely, 2^{31213120021210} is an apocalyptic number.

31213120021210 is a deficient number, since it is larger than the sum of its proper divisors (30057237716390).

31213120021210 is a wasteful number, since it uses less digits than its factorization.

31213120021210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8368255.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 31213120021210 its reverse (1212002131213), we get a palindrome (32425122152423).

The spelling of 31213120021210 in words is "thirty-one trillion, two hundred thirteen billion, one hundred twenty million, twenty-one thousand, two hundred ten".