21723201501 has 8 divisors (see below), whose sum is σ = 28966123200. Its totient is φ = 14481207072.

The previous prime is 21723201499. The next prime is 21723201509. The reversal of 21723201501 is 10510232712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21723201501 - 2¹ = 21723201499 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21723201509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175176 + ... + 272273.

It is an arithmetic number, because the mean of its divisors is an integer number (3620765400).

Almost surely, 2^21723201501 is an apocalyptic number.

It is an amenable number.

21723201501 is a deficient number, since it is larger than the sum of its proper divisors (7242921699).

21723201501 is a wasteful number, since it uses less digits than its factorization.

21723201501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463635.

The product of its (nonzero) digits is 840, while the sum is 24.

The spelling of 21723201501 in words is "twenty-one billion, seven hundred twenty-three million, two hundred one thousand, five hundred one".