21904739147 has 8 divisors (see below), whose sum is σ = 22080847872. Its totient is φ = 21728687400.

The previous prime is 21904739107. The next prime is 21904739167. The reversal of 21904739147 is 74193740912.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21904739147 is a prime.

It is a super-2 number, since 2×21904739147² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21904739107) 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, 1111772 + ... + 1131302.

It is an arithmetic number, because the mean of its divisors is an integer number (2760105984).

Almost surely, 2^21904739147 is an apocalyptic number.

21904739147 is a deficient number, since it is larger than the sum of its proper divisors (176108725).

21904739147 is a wasteful number, since it uses less digits than its factorization.

21904739147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28489.

The product of its (nonzero) digits is 381024, while the sum is 47.

The spelling of 21904739147 in words is "twenty-one billion, nine hundred four million, seven hundred thirty-nine thousand, one hundred forty-seven".