31220013311 has 16 divisors (see below), whose sum is σ = 31621224000. Its totient is φ = 30822156288.

The previous prime is 31220013289. The next prime is 31220013323. The reversal of 31220013311 is 11331002213.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31220013311 is a prime.

It is a super-2 number, since 2×31220013311² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31220013311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31220013611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19548365 + ... + 19549961.

It is an arithmetic number, because the mean of its divisors is an integer number (1976326500).

Almost surely, 2^31220013311 is an apocalyptic number.

31220013311 is a deficient number, since it is larger than the sum of its proper divisors (401210689).

31220013311 is a wasteful number, since it uses less digits than its factorization.

31220013311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2498.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 31220013311 its reverse (11331002213), we get a palindrome (42551015524).

The spelling of 31220013311 in words is "thirty-one billion, two hundred twenty million, thirteen thousand, three hundred eleven".