21736374213553 has 4 divisors (see below), whose sum is σ = 21880323711808. Its totient is φ = 21592424715300.

The previous prime is 21736374213551. The next prime is 21736374213571. The reversal of 21736374213553 is 35531247363712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21736374213553 - 2¹ = 21736374213551 is a prime.

It is a super-2 number, since 2×21736374213553² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21736374213553.

It is not an unprimeable number, because it can be changed into a prime (21736374213551) 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, 71974748901 + ... + 71974749202.

It is an arithmetic number, because the mean of its divisors is an integer number (5470080927952).

Almost surely, 2^{21736374213553} is an apocalyptic number.

It is an amenable number.

21736374213553 is a deficient number, since it is larger than the sum of its proper divisors (143949498255).

21736374213553 is a wasteful number, since it uses less digits than its factorization.

21736374213553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143949498254.

The product of its digits is 9525600, while the sum is 52.

The spelling of 21736374213553 in words is "twenty-one trillion, seven hundred thirty-six billion, three hundred seventy-four million, two hundred thirteen thousand, five hundred fifty-three".