21210000013213 has 16 divisors (see below), whose sum is σ = 23703146691840. Its totient is φ = 18811038707200.

The previous prime is 21210000013207. The next prime is 21210000013337. The reversal of 21210000013213 is 31231000001212.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21210000013213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210000013613) 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, 17251356 + ... + 18439882.

It is an arithmetic number, because the mean of its divisors is an integer number (1481446668240).

Almost surely, 2^{21210000013213} is an apocalyptic number.

It is an amenable number.

21210000013213 is a deficient number, since it is larger than the sum of its proper divisors (2493146678627).

21210000013213 is a wasteful number, since it uses less digits than its factorization.

21210000013213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1228148.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21210000013213 its reverse (31231000001212), we get a palindrome (52441000014425).

The spelling of 21210000013213 in words is "twenty-one trillion, two hundred ten billion, thirteen thousand, two hundred thirteen".