21602421640799 has 16 divisors (see below), whose sum is σ = 22668653157120. Its totient is φ = 20546783959680.

The previous prime is 21602421640781. The next prime is 21602421640831. The reversal of 21602421640799 is 99704612420612.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21602421640799 - 2⁸ = 21602421640543 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 21602421640799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21602421640199) 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, 96790364 + ... + 97013294.

It is an arithmetic number, because the mean of its divisors is an integer number (1416790822320).

Almost surely, 2^{21602421640799} is an apocalyptic number.

21602421640799 is a deficient number, since it is larger than the sum of its proper divisors (1066231516321).

21602421640799 is a wasteful number, since it uses less digits than its factorization.

21602421640799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246670.

The product of its (nonzero) digits is 2612736, while the sum is 53.

The spelling of 21602421640799 in words is "twenty-one trillion, six hundred two billion, four hundred twenty-one million, six hundred forty thousand, seven hundred ninety-nine".