21623996601 has 15 divisors (see below), whose sum is σ = 32304490581. Its totient is φ = 14415115428.

The previous prime is 21623996579. The next prime is 21623996609. The reversal of 21623996601 is 10669932612.

The square root of 21623996601 is 147051.

It is a perfect power (a square), and thus also a powerful number.

21623996601 is a `hidden beast` number, since 2 + 1 + 6 + 2 + 39 + 9 + 6 + 601 = 666.

It is not a de Polignac number, because 21623996601 - 2¹⁵ = 21623963833 is a prime.

It is a super-3 number, since 3×21623996601³ (a number of 32 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21623996609) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 1315290 + ... + 1331628.

Almost surely, 2^21623996601 is an apocalyptic number.

21623996601 is the 147051-st square number.

21623996601 is the 73526-th centered octagonal number.

It is an amenable number.

21623996601 is a deficient number, since it is larger than the sum of its proper divisors (10680493980).

21623996601 is an frugal number, since it uses more digits than its factorization.

21623996601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32690 (or 16342 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 45.

The spelling of 21623996601 in words is "twenty-one billion, six hundred twenty-three million, nine hundred ninety-six thousand, six hundred one".