31311031213100 has 36 divisors (see below), whose sum is σ = 67945856525400. Its totient is φ = 12524243122560.

The previous prime is 31311031213079. The next prime is 31311031213103. The reversal of 31311031213100 is 131213011313.

It is a super-2 number, since 2×31311031213100² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (31311031213103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5449511 + ... + 9608289.

Almost surely, 2^{31311031213100} is an apocalyptic number.

It is an amenable number.

31311031213100 is an abundant number, since it is smaller than the sum of its proper divisors (36634825312300).

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

31311031213100 is a wasteful number, since it uses less digits than its factorization.

31311031213100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4234082 (or 4234075 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 20.

Adding to 31311031213100 its reverse (131213011313), we get a palindrome (31442244224413).

The spelling of 31311031213100 in words is "thirty-one trillion, three hundred eleven billion, thirty-one million, two hundred thirteen thousand, one hundred".