21004074777 has 8 divisors (see below), whose sum is σ = 32006209216. Its totient is φ = 12002328432.

The previous prime is 21004074737. The next prime is 21004074809. The reversal of 21004074777 is 77747040012.

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

It is not a de Polignac number, because 21004074777 - 2⁷ = 21004074649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21004074727) 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, 500096998 + ... + 500097039.

It is an arithmetic number, because the mean of its divisors is an integer number (4000776152).

Almost surely, 2^21004074777 is an apocalyptic number.

It is an amenable number.

21004074777 is a deficient number, since it is larger than the sum of its proper divisors (11002134439).

21004074777 is a wasteful number, since it uses less digits than its factorization.

21004074777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1000194047.

The product of its (nonzero) digits is 76832, while the sum is 39.

The spelling of 21004074777 in words is "twenty-one billion, four million, seventy-four thousand, seven hundred seventy-seven".