31213333011 has 16 divisors (see below), whose sum is σ = 47570924288. Its totient is φ = 17833284000.

The previous prime is 31213333009. The next prime is 31213333027. The reversal of 31213333011 is 11033331213.

It is not a de Polignac number, because 31213333011 - 2¹ = 31213333009 is a prime.

It is a super-2 number, since 2×31213333011² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31213332011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14376 + ... + 250266.

It is an arithmetic number, because the mean of its divisors is an integer number (2973182768).

Almost surely, 2^31213333011 is an apocalyptic number.

31213333011 is a deficient number, since it is larger than the sum of its proper divisors (16357591277).

31213333011 is a wasteful number, since it uses less digits than its factorization.

31213333011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242202.

The product of its (nonzero) digits is 486, while the sum is 21.

Adding to 31213333011 its reverse (11033331213), we get a palindrome (42246664224).

The spelling of 31213333011 in words is "thirty-one billion, two hundred thirteen million, three hundred thirty-three thousand, eleven".