31970921011 has 4 divisors (see below), whose sum is σ = 32138308224. Its totient is φ = 31803533800.

The previous prime is 31970921009. The next prime is 31970921027. The reversal of 31970921011 is 11012907913.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31970921011 - 2¹ = 31970921009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31970921041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83693320 + ... + 83693701.

It is an arithmetic number, because the mean of its divisors is an integer number (8034577056).

Almost surely, 2^31970921011 is an apocalyptic number.

31970921011 is a deficient number, since it is larger than the sum of its proper divisors (167387213).

31970921011 is a wasteful number, since it uses less digits than its factorization.

31970921011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167387212.

The product of its (nonzero) digits is 3402, while the sum is 34.

The spelling of 31970921011 in words is "thirty-one billion, nine hundred seventy million, nine hundred twenty-one thousand, eleven".