21337230639 has 4 divisors (see below), whose sum is σ = 28449640856. Its totient is φ = 14224820424.

The previous prime is 21337230623. The next prime is 21337230659. The reversal of 21337230639 is 93603273312.

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

It is not a de Polignac number, because 21337230639 - 2⁴ = 21337230623 is a prime.

It is a super-2 number, since 2×21337230639² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21337230597 and 21337230606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21337230659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3556205104 + ... + 3556205109.

It is an arithmetic number, because the mean of its divisors is an integer number (7112410214).

Almost surely, 2^21337230639 is an apocalyptic number.

21337230639 is a deficient number, since it is larger than the sum of its proper divisors (7112410217).

21337230639 is an equidigital number, since it uses as much as digits as its factorization.

21337230639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7112410216.

The product of its (nonzero) digits is 122472, while the sum is 39.

The spelling of 21337230639 in words is "twenty-one billion, three hundred thirty-seven million, two hundred thirty thousand, six hundred thirty-nine".