21123576401 has 8 divisors (see below), whose sum is σ = 22242235680. Its totient is φ = 20005606368.

The previous prime is 21123576379. The next prime is 21123576433. The reversal of 21123576401 is 10467532112.

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 21123576401 - 2⁶ = 21123576337 is a prime.

It is a super-2 number, since 2×21123576401² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21123576451) 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, 108791 + ... + 232556.

It is an arithmetic number, because the mean of its divisors is an integer number (2780279460).

Almost surely, 2^21123576401 is an apocalyptic number.

It is an amenable number.

21123576401 is a deficient number, since it is larger than the sum of its proper divisors (1118659279).

21123576401 is a wasteful number, since it uses less digits than its factorization.

21123576401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344623.

The product of its (nonzero) digits is 10080, while the sum is 32.

The spelling of 21123576401 in words is "twenty-one billion, one hundred twenty-three million, five hundred seventy-six thousand, four hundred one".