21253431435213 has 16 divisors (see below), whose sum is σ = 28377318412800. Its totient is φ = 14149256084400.

The previous prime is 21253431435179. The next prime is 21253431435217. The reversal of 21253431435213 is 31253413435212.

It is a happy number.

It is not a de Polignac number, because 21253431435213 - 2⁶ = 21253431435149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21253431435217) 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, 11877498 + ... + 13549236.

It is an arithmetic number, because the mean of its divisors is an integer number (1773582400800).

Almost surely, 2^{21253431435213} is an apocalyptic number.

It is an amenable number.

21253431435213 is a deficient number, since it is larger than the sum of its proper divisors (7123886977587).

21253431435213 is a wasteful number, since it uses less digits than its factorization.

21253431435213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1677632.

The product of its digits is 259200, while the sum is 39.

The spelling of 21253431435213 in words is "twenty-one trillion, two hundred fifty-three billion, four hundred thirty-one million, four hundred thirty-five thousand, two hundred thirteen".