31211500211213 has 32 divisors (see below), whose sum is σ = 36488348909568. Its totient is φ = 26141028451200.

The previous prime is 31211500211183. The next prime is 31211500211261. The reversal of 31211500211213 is 31211200511213.

It is a cyclic number.

It is not a de Polignac number, because 31211500211213 - 2¹² = 31211500207117 is a prime.

It is a super-2 number, since 2×31211500211213² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31211500211273) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2104469708 + ... + 2104484538.

It is an arithmetic number, because the mean of its divisors is an integer number (1140260903424).

Almost surely, 2^{31211500211213} is an apocalyptic number.

It is an amenable number.

31211500211213 is a deficient number, since it is larger than the sum of its proper divisors (5276848698355).

31211500211213 is a wasteful number, since it uses less digits than its factorization.

31211500211213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24833.

The product of its (nonzero) digits is 360, while the sum is 23.

Adding to 31211500211213 its reverse (31211200511213), we get a palindrome (62422700722426).

The spelling of 31211500211213 in words is "thirty-one trillion, two hundred eleven billion, five hundred million, two hundred eleven thousand, two hundred thirteen".