21612668153 has 8 divisors (see below), whose sum is σ = 21725817216. Its totient is φ = 21499765200.

The previous prime is 21612668117. The next prime is 21612668197. The reversal of 21612668153 is 35186621612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21612668153 - 2¹² = 21612664057 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 21612668153.

It is not an unprimeable number, because it can be changed into a prime (21612698153) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115898 + ... + 238028.

It is an arithmetic number, because the mean of its divisors is an integer number (2715727152).

Almost surely, 2^21612668153 is an apocalyptic number.

It is an amenable number.

21612668153 is a deficient number, since it is larger than the sum of its proper divisors (113149063).

21612668153 is a wasteful number, since it uses less digits than its factorization.

21612668153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123055.

The product of its digits is 103680, while the sum is 41.

The spelling of 21612668153 in words is "twenty-one billion, six hundred twelve million, six hundred sixty-eight thousand, one hundred fifty-three".