21000477139 has 8 divisors (see below), whose sum is σ = 21129818112. Its totient is φ = 20871525000.

The previous prime is 21000477133. The next prime is 21000477143. The reversal of 21000477139 is 93177400012.

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

It is a cyclic number.

It is not a de Polignac number, because 21000477139 - 2²⁷ = 20866259411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21000477133) 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, 11514 + ... + 205264.

It is an arithmetic number, because the mean of its divisors is an integer number (2641227264).

Almost surely, 2^21000477139 is an apocalyptic number.

21000477139 is a deficient number, since it is larger than the sum of its proper divisors (129340973).

21000477139 is a wasteful number, since it uses less digits than its factorization.

21000477139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194417.

The product of its (nonzero) digits is 10584, while the sum is 34.

The spelling of 21000477139 in words is "twenty-one billion, four hundred seventy-seven thousand, one hundred thirty-nine".