21383522507 has 4 divisors (see below), whose sum is σ = 22508971080. Its totient is φ = 20258073936.

The previous prime is 21383522491. The next prime is 21383522509. The reversal of 21383522507 is 70522538312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21383522507 - 2⁴ = 21383522491 is a prime.

It is a super-3 number, since 3×21383522507³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21383522509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 562724258 + ... + 562724295.

It is an arithmetic number, because the mean of its divisors is an integer number (5627242770).

Almost surely, 2^21383522507 is an apocalyptic number.

21383522507 is a deficient number, since it is larger than the sum of its proper divisors (1125448573).

21383522507 is a wasteful number, since it uses less digits than its factorization.

21383522507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1125448572.

The product of its (nonzero) digits is 100800, while the sum is 38.

The spelling of 21383522507 in words is "twenty-one billion, three hundred eighty-three million, five hundred twenty-two thousand, five hundred seven".