21675572254209 has 16 divisors (see below), whose sum is σ = 29378279007104. Its totient is φ = 14211683712000.

The previous prime is 21675572254207. The next prime is 21675572254243. The reversal of 21675572254209 is 90245227557612.

It is not a de Polignac number, because 21675572254209 - 2¹ = 21675572254207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21675572254207) 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, 6081517 + ... + 8963034.

It is an arithmetic number, because the mean of its divisors is an integer number (1836142437944).

Almost surely, 2^{21675572254209} is an apocalyptic number.

It is an amenable number.

21675572254209 is a deficient number, since it is larger than the sum of its proper divisors (7702706752895).

21675572254209 is a wasteful number, since it uses less digits than its factorization.

21675572254209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15052488.

The product of its (nonzero) digits is 21168000, while the sum is 57.

The spelling of 21675572254209 in words is "twenty-one trillion, six hundred seventy-five billion, five hundred seventy-two million, two hundred fifty-four thousand, two hundred nine".