21618194963029 has 64 divisors (see below), whose sum is σ = 26511397355520. Its totient is φ = 17207012736000.

The previous prime is 21618194962981. The next prime is 21618194963033. The reversal of 21618194963029 is 92036949181612.

It is a cyclic number.

It is not a de Polignac number, because 21618194963029 - 2¹⁷ = 21618194831957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21618194963929) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3575025084 + ... + 3575031130.

It is an arithmetic number, because the mean of its divisors is an integer number (414240583680).

Almost surely, 2^{21618194963029} is an apocalyptic number.

It is an amenable number.

21618194963029 is a deficient number, since it is larger than the sum of its proper divisors (4893202392491).

21618194963029 is a wasteful number, since it uses less digits than its factorization.

21618194963029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7298.

The product of its (nonzero) digits is 10077696, while the sum is 61.

The spelling of 21618194963029 in words is "twenty-one trillion, six hundred eighteen billion, one hundred ninety-four million, nine hundred sixty-three thousand, twenty-nine".