21623523621601 has 16 divisors (see below), whose sum is σ = 24165960033600. Its totient is φ = 19177249561600.

The previous prime is 21623523621593. The next prime is 21623523621677. The reversal of 21623523621601 is 10612632532612.

It is a cyclic number.

It is not a de Polignac number, because 21623523621601 - 2³ = 21623523621593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21623523621701) 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, 7067985 + ... + 9654193.

It is an arithmetic number, because the mean of its divisors is an integer number (1510372502100).

Almost surely, 2^{21623523621601} is an apocalyptic number.

It is an amenable number.

21623523621601 is a deficient number, since it is larger than the sum of its proper divisors (2542436411999).

21623523621601 is a wasteful number, since it uses less digits than its factorization.

21623523621601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2604800.

The product of its (nonzero) digits is 155520, while the sum is 40.

The spelling of 21623523621601 in words is "twenty-one trillion, six hundred twenty-three billion, five hundred twenty-three million, six hundred twenty-one thousand, six hundred one".