21002123211213 has 16 divisors (see below), whose sum is σ = 28948845574656. Its totient is φ = 13529742457920.

The previous prime is 21002123211211. The next prime is 21002123211217. The reversal of 21002123211213 is 31211232120012.

It is not a de Polignac number, because 21002123211213 - 2¹ = 21002123211211 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21002123211213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002123211211) 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, 166723806 + ... + 166849727.

It is an arithmetic number, because the mean of its divisors is an integer number (1809302848416).

Almost surely, 2^{21002123211213} is an apocalyptic number.

It is an amenable number.

21002123211213 is a deficient number, since it is larger than the sum of its proper divisors (7946722363443).

21002123211213 is a wasteful number, since it uses less digits than its factorization.

21002123211213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333574244.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 21002123211213 its reverse (31211232120012), we get a palindrome (52213355331225).

The spelling of 21002123211213 in words is "twenty-one trillion, two billion, one hundred twenty-three million, two hundred eleven thousand, two hundred thirteen".