21232714521145 has 8 divisors (see below), whose sum is σ = 25479432024840. Its totient is φ = 16986055217280.

The previous prime is 21232714521059. The next prime is 21232714521173. The reversal of 21232714521145 is 54112541723212.

It can be written as a sum of positive squares in 4 ways, for example, as 9836634868281 + 11396079652864 = 3136341^2 + 3375808^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21232714521145 - 2¹⁷ = 21232714390073 is a prime.

It is a super-2 number, since 2×21232714521145² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21232714521098 and 21232714521107.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13743276 + ... + 15209965.

It is an arithmetic number, because the mean of its divisors is an integer number (3184929003105).

Almost surely, 2^{21232714521145} is an apocalyptic number.

It is an amenable number.

21232714521145 is a deficient number, since it is larger than the sum of its proper divisors (4246717503695).

21232714521145 is a wasteful number, since it uses less digits than its factorization.

21232714521145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29099915.

The product of its digits is 134400, while the sum is 40.

The spelling of 21232714521145 in words is "twenty-one trillion, two hundred thirty-two billion, seven hundred fourteen million, five hundred twenty-one thousand, one hundred forty-five".