21623605540099 has 16 divisors (see below), whose sum is σ = 22845382560000. Its totient is φ = 20425510062496.

The previous prime is 21623605540051. The next prime is 21623605540169. The reversal of 21623605540099 is 99004550632612.

It is a cyclic number.

It is not a de Polignac number, because 21623605540099 - 2⁷ = 21623605539971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21623605540799) 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, 2043777 + ... + 6886525.

It is an arithmetic number, because the mean of its divisors is an integer number (1427836410000).

Almost surely, 2^{21623605540099} is an apocalyptic number.

21623605540099 is a deficient number, since it is larger than the sum of its proper divisors (1221777019901).

21623605540099 is a wasteful number, since it uses less digits than its factorization.

21623605540099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4845194.

The product of its (nonzero) digits is 3499200, while the sum is 52.

The spelling of 21623605540099 in words is "twenty-one trillion, six hundred twenty-three billion, six hundred five million, five hundred forty thousand, ninety-nine".