21612640773573 has 32 divisors (see below), whose sum is σ = 32137402389120. Its totient is φ = 14355091584000.

The previous prime is 21612640773571. The next prime is 21612640773583. The reversal of 21612640773573 is 37537704621612.

21612640773573 is a `hidden beast` number, since 2 + 1 + 6 + 1 + 2 + 64 + 0 + 7 + 7 + 3 + 573 = 666.

It is not a de Polignac number, because 21612640773573 - 2¹ = 21612640773571 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21612640773571) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10454323 + ... + 12349823.

It is an arithmetic number, because the mean of its divisors is an integer number (1004293824660).

Almost surely, 2^{21612640773573} is an apocalyptic number.

It is an amenable number.

21612640773573 is a deficient number, since it is larger than the sum of its proper divisors (10524761615547).

21612640773573 is a wasteful number, since it uses less digits than its factorization.

21612640773573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1897074 (or 1897068 counting only the distinct ones).

The product of its (nonzero) digits is 8890560, while the sum is 54.

The spelling of 21612640773573 in words is "twenty-one trillion, six hundred twelve billion, six hundred forty million, seven hundred seventy-three thousand, five hundred seventy-three".