21623077081 has 8 divisors (see below), whose sum is σ = 21679243200. Its totient is φ = 21566981520.

The previous prime is 21623077013. The next prime is 21623077169. The reversal of 21623077081 is 18077032612.

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 21623077081 - 2⁷ = 21623076953 is a prime.

It is a super-2 number, since 2×21623077081² (a number of 21 digits) contains 22 as substring.

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 21623077081.

It is not an unprimeable number, because it can be changed into a prime (21623077181) 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, 626175 + ... + 659803.

It is an arithmetic number, because the mean of its divisors is an integer number (2709905400).

Almost surely, 2^21623077081 is an apocalyptic number.

It is an amenable number.

21623077081 is a deficient number, since it is larger than the sum of its proper divisors (56166119).

21623077081 is a wasteful number, since it uses less digits than its factorization.

21623077081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35279.

The product of its (nonzero) digits is 28224, while the sum is 37.

The spelling of 21623077081 in words is "twenty-one billion, six hundred twenty-three million, seventy-seven thousand, eighty-one".