21167361653 has 16 divisors (see below), whose sum is σ = 21591490560. Its totient is φ = 20748798000.

The previous prime is 21167361629. The next prime is 21167361661. The reversal of 21167361653 is 35616376112.

It is a cyclic number.

It is not a de Polignac number, because 21167361653 - 2¹⁰ = 21167360629 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21167361653.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21167361613) 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, 3659918 + ... + 3665696.

It is an arithmetic number, because the mean of its divisors is an integer number (1349468160).

Almost surely, 2^21167361653 is an apocalyptic number.

It is an amenable number.

21167361653 is a deficient number, since it is larger than the sum of its proper divisors (424128907).

21167361653 is a wasteful number, since it uses less digits than its factorization.

21167361653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6248.

The product of its digits is 136080, while the sum is 41.

The spelling of 21167361653 in words is "twenty-one billion, one hundred sixty-seven million, three hundred sixty-one thousand, six hundred fifty-three".