31211205011 has 16 divisors (see below), whose sum is σ = 36511098624. Its totient is φ = 26121995424.

The previous prime is 31211204987. The next prime is 31211205017. The reversal of 31211205011 is 11050211213.

It is a de Polignac number, because none of the positive numbers 2^k-31211205011 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31211205017) 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, 1043876 + ... + 1073358.

It is an arithmetic number, because the mean of its divisors is an integer number (2281943664).

Almost surely, 2^31211205011 is an apocalyptic number.

31211205011 is a deficient number, since it is larger than the sum of its proper divisors (5299893613).

31211205011 is a wasteful number, since it uses less digits than its factorization.

31211205011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33050.

The product of its (nonzero) digits is 60, while the sum is 17.

Adding to 31211205011 its reverse (11050211213), we get a palindrome (42261416224).

The spelling of 31211205011 in words is "thirty-one billion, two hundred eleven million, two hundred five thousand, eleven".