21357673653 has 16 divisors (see below), whose sum is σ = 30148966080. Its totient is φ = 13411079424.

The previous prime is 21357673643. The next prime is 21357673669. The reversal of 21357673653 is 35637675312.

It is a de Polignac number, because none of the positive numbers 2^k-21357673653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21357673613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1073076 + ... + 1092797.

It is an arithmetic number, because the mean of its divisors is an integer number (1884310380).

Almost surely, 2^21357673653 is an apocalyptic number.

It is an amenable number.

21357673653 is a deficient number, since it is larger than the sum of its proper divisors (8791292427).

21357673653 is a wasteful number, since it uses less digits than its factorization.

21357673653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2166068.

The product of its digits is 2381400, while the sum is 48.

The spelling of 21357673653 in words is "twenty-one billion, three hundred fifty-seven million, six hundred seventy-three thousand, six hundred fifty-three".