213113020123021 has 16 divisors (see below), whose sum is σ = 221357829559680. Its totient is φ = 205035482615040.

The previous prime is 213113020122851. The next prime is 213113020123027. The reversal of 213113020123021 is 120321020311312.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213113020123021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213113020122983 and 213113020123001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213113020123027) 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, 104861760 + ... + 106874761.

It is an arithmetic number, because the mean of its divisors is an integer number (13834864347480).

Almost surely, 2^{213113020123021} is an apocalyptic number.

It is an amenable number.

213113020123021 is a deficient number, since it is larger than the sum of its proper divisors (8244809436659).

213113020123021 is a wasteful number, since it uses less digits than its factorization.

213113020123021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211736916.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 213113020123021 its reverse (120321020311312), we get a palindrome (333434040434333).

The spelling of 213113020123021 in words is "two hundred thirteen trillion, one hundred thirteen billion, twenty million, one hundred twenty-three thousand, twenty-one".