21402008737 has 8 divisors (see below), whose sum is σ = 22615223040. Its totient is φ = 20212352160.

The previous prime is 21402008701. The next prime is 21402008743. The reversal of 21402008737 is 73780020412.

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

It is not a de Polignac number, because 21402008737 - 2⁷ = 21402008609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21402008767) 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 7 ways as a sum of consecutive naturals, for example, 5887564 + ... + 5891197.

It is an arithmetic number, because the mean of its divisors is an integer number (2826902880).

Almost surely, 2^21402008737 is an apocalyptic number.

It is an amenable number.

21402008737 is a deficient number, since it is larger than the sum of its proper divisors (1213214303).

21402008737 is a wasteful number, since it uses less digits than its factorization.

21402008737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11778863.

The product of its (nonzero) digits is 18816, while the sum is 34.

The spelling of 21402008737 in words is "twenty-one billion, four hundred two million, eight thousand, seven hundred thirty-seven".