21055161632 has 54 divisors (see below), whose sum is σ = 42007482153. Its totient is φ = 10388449792.

The previous prime is 21055161629. The next prime is 21055161667. The reversal of 21055161632 is 23616155012.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 13297779856 + 7757381776 = 115316^2 + 88076^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=102604.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 92753903 + ... + 92754129.

Almost surely, 2^21055161632 is an apocalyptic number.

It is an amenable number.

21055161632 is a deficient number, since it is larger than the sum of its proper divisors (20952320521).

21055161632 is an frugal number, since it uses more digits than its factorization.

21055161632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690 (or 342 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 32.

Multiplying 21055161632 by its sum of digits (32), we get a square (673765172224 = 820832²).

21055161632 divided by its sum of digits (32) gives a square (657973801 = 25651²).

The spelling of 21055161632 in words is "twenty-one billion, fifty-five million, one hundred sixty-one thousand, six hundred thirty-two".