21692745145 has 8 divisors (see below), whose sum is σ = 26666204040. Its totient is φ = 16930922880.

The previous prime is 21692745119. The next prime is 21692745149. The reversal of 21692745145 is 54154729612.

It can be written as a sum of positive squares in 4 ways, for example, as 2051002944 + 19641742201 = 45288^2 + 140149^2 .

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

It is not a de Polignac number, because 21692745145 - 2²⁵ = 21659190713 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21692745095 and 21692745104.

It is not an unprimeable number, because it can be changed into a prime (21692745149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52908930 + ... + 52909339.

It is an arithmetic number, because the mean of its divisors is an integer number (3333275505).

Almost surely, 2^21692745145 is an apocalyptic number.

It is an amenable number.

21692745145 is a deficient number, since it is larger than the sum of its proper divisors (4973458895).

21692745145 is a wasteful number, since it uses less digits than its factorization.

21692745145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105818315.

The product of its digits is 604800, while the sum is 46.

The spelling of 21692745145 in words is "twenty-one billion, six hundred ninety-two million, seven hundred forty-five thousand, one hundred forty-five".