21039177149 has 16 divisors (see below), whose sum is σ = 21654528000. Its totient is φ = 20431148400.

The previous prime is 21039177139. The next prime is 21039177151. The reversal of 21039177149 is 94177193012.

It is a cyclic number.

It is not a de Polignac number, because 21039177149 - 2¹² = 21039173053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21039177139) 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, 10523852 + ... + 10525850.

It is an arithmetic number, because the mean of its divisors is an integer number (1353408000).

Almost surely, 2^21039177149 is an apocalyptic number.

It is an amenable number.

21039177149 is a deficient number, since it is larger than the sum of its proper divisors (615350851).

21039177149 is a wasteful number, since it uses less digits than its factorization.

21039177149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3680.

The product of its (nonzero) digits is 95256, while the sum is 44.

The spelling of 21039177149 in words is "twenty-one billion, thirty-nine million, one hundred seventy-seven thousand, one hundred forty-nine".