21356374507 has 16 divisors (see below), whose sum is σ = 23670339840. Its totient is φ = 19140527232.

The previous prime is 21356374493. The next prime is 21356374513. The reversal of 21356374507 is 70547365312.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21356374507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21356374007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 184053 + ... + 276745.

It is an arithmetic number, because the mean of its divisors is an integer number (1479396240).

Almost surely, 2^21356374507 is an apocalyptic number.

21356374507 is a deficient number, since it is larger than the sum of its proper divisors (2313965333).

21356374507 is a wasteful number, since it uses less digits than its factorization.

21356374507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93222.

The product of its (nonzero) digits is 529200, while the sum is 43.

The spelling of 21356374507 in words is "twenty-one billion, three hundred fifty-six million, three hundred seventy-four thousand, five hundred seven".