109421362521 has 27 divisors (see below), whose sum is σ = 160413825247. Its totient is φ = 71873833920.

The previous prime is 109421362487. The next prime is 109421362543. The reversal of 109421362521 is 125263124901.

The square root of 109421362521 is 330789.

It is a perfect power (a square), and thus also a powerful number.

109421362521 is a `hidden beast` number, since 1 + 0 + 9 + 4 + 2 + 1 + 3 + 625 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 11116539225 + 98304823296 = 105435^2 + 313536^2 .

It is not a de Polignac number, because 109421362521 - 2¹¹ = 109421360473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (109421362571) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 70457281 + ... + 70458833.

Almost surely, 2^109421362521 is an apocalyptic number.

109421362521 is the 330789-th square number.

109421362521 is the 165395-th centered octagonal number.

It is an amenable number.

109421362521 is a deficient number, since it is larger than the sum of its proper divisors (50992462726).

109421362521 is an frugal number, since it uses more digits than its factorization.

109421362521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3254 (or 1627 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

Multiplying 109421362521 by its sum of digits (36), we get a square (3939169050756 = 1984734²).

The spelling of 109421362521 in words is "one hundred nine billion, four hundred twenty-one million, three hundred sixty-two thousand, five hundred twenty-one".