21307520774 has 8 divisors (see below), whose sum is σ = 31962955320. Its totient is φ = 10653202336.

The previous prime is 21307520753. The next prime is 21307520837. The reversal of 21307520774 is 47702570312.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 229544 + ... + 308715.

It is an arithmetic number, because the mean of its divisors is an integer number (3995369415).

Almost surely, 2^21307520774 is an apocalyptic number.

21307520774 is a deficient number, since it is larger than the sum of its proper divisors (10655434546).

21307520774 is a wasteful number, since it uses less digits than its factorization.

21307520774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558054.

The product of its (nonzero) digits is 82320, while the sum is 38.

The spelling of 21307520774 in words is "twenty-one billion, three hundred seven million, five hundred twenty thousand, seven hundred seventy-four".