21213436396153 has 4 divisors (see below), whose sum is σ = 21220366629988. Its totient is φ = 21206506162320.

The previous prime is 21213436396079. The next prime is 21213436396213. The reversal of 21213436396153 is 35169363431212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18294713581824 + 2918722814329 = 4277232^2 + 1708427^2 .

It is a cyclic number.

It is not a de Polignac number, because 21213436396153 - 2²⁹ = 21212899525241 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21213436396097 and 21213436396106.

It is not an unprimeable number, because it can be changed into a prime (21213436396253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3465112326 + ... + 3465118447.

It is an arithmetic number, because the mean of its divisors is an integer number (5305091657497).

Almost surely, 2^{21213436396153} is an apocalyptic number.

It is an amenable number.

21213436396153 is a deficient number, since it is larger than the sum of its proper divisors (6930233835).

21213436396153 is an equidigital number, since it uses as much as digits as its factorization.

21213436396153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6930233834.

The product of its digits is 2099520, while the sum is 49.

The spelling of 21213436396153 in words is "twenty-one trillion, two hundred thirteen billion, four hundred thirty-six million, three hundred ninety-six thousand, one hundred fifty-three".