21177004430 has 16 divisors (see below), whose sum is σ = 38546908560. Its totient is φ = 8375623872.

The previous prime is 21177004421. The next prime is 21177004441. The reversal of 21177004430 is 3440077112.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21177004393 and 21177004402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11896304 + ... + 11898083.

It is an arithmetic number, because the mean of its divisors is an integer number (2409181785).

Almost surely, 2^21177004430 is an apocalyptic number.

21177004430 is a deficient number, since it is larger than the sum of its proper divisors (17369904130).

21177004430 is a wasteful number, since it uses less digits than its factorization.

21177004430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23794483.

The product of its (nonzero) digits is 4704, while the sum is 29.

The spelling of 21177004430 in words is "twenty-one billion, one hundred seventy-seven million, four thousand, four hundred thirty".