21382507623 has 8 divisors (see below), whose sum is σ = 28511321328. Its totient is φ = 14254349504.

The previous prime is 21382507577. The next prime is 21382507667. The reversal of 21382507623 is 32670528312.

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 21382507623 - 2¹⁰ = 21382506599 is a prime.

It is a super-2 number, since 2×21382507623² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21382502623) 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, 81936 + ... + 222437.

It is an arithmetic number, because the mean of its divisors is an integer number (3563915166).

Almost surely, 2^21382507623 is an apocalyptic number.

21382507623 is a deficient number, since it is larger than the sum of its proper divisors (7128813705).

21382507623 is a wasteful number, since it uses less digits than its factorization.

21382507623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327793.

The product of its (nonzero) digits is 120960, while the sum is 39.

The spelling of 21382507623 in words is "twenty-one billion, three hundred eighty-two million, five hundred seven thousand, six hundred twenty-three".