21031021323213 has 32 divisors (see below), whose sum is σ = 30832908733440. Its totient is φ = 12645216754560.

The previous prime is 21031021323167. The next prime is 21031021323227. The reversal of 21031021323213 is 31232312013012.

It is not a de Polignac number, because 21031021323213 - 2³⁶ = 20962301846477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031021323253) 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, 5882856 + ... + 8756142.

It is an arithmetic number, because the mean of its divisors is an integer number (963528397920).

Almost surely, 2^{21031021323213} is an apocalyptic number.

It is an amenable number.

21031021323213 is a deficient number, since it is larger than the sum of its proper divisors (9801887410227).

21031021323213 is a wasteful number, since it uses less digits than its factorization.

21031021323213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2875057.

The product of its (nonzero) digits is 1296, while the sum is 24.

Adding to 21031021323213 its reverse (31232312013012), we get a palindrome (52263333336225).

The spelling of 21031021323213 in words is "twenty-one trillion, thirty-one billion, twenty-one million, three hundred twenty-three thousand, two hundred thirteen".