21357172234453 has 16 divisors (see below), whose sum is σ = 23389176275136. Its totient is φ = 19340384103040.

The previous prime is 21357172234427. The next prime is 21357172234457. The reversal of 21357172234453 is 35443227175312.

It is not a de Polignac number, because 21357172234453 - 2²⁵ = 21357138680021 is a prime.

It is a super-2 number, since 2×21357172234453² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21357172234397 and 21357172234406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21357172234457) 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, 545026 + ... + 6558307.

It is an arithmetic number, because the mean of its divisors is an integer number (1461823517196).

Almost surely, 2^{21357172234453} is an apocalyptic number.

It is an amenable number.

21357172234453 is a deficient number, since it is larger than the sum of its proper divisors (2032004040683).

21357172234453 is a wasteful number, since it uses less digits than its factorization.

21357172234453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7104404.

The product of its digits is 4233600, while the sum is 49.

The spelling of 21357172234453 in words is "twenty-one trillion, three hundred fifty-seven billion, one hundred seventy-two million, two hundred thirty-four thousand, four hundred fifty-three".