21748763390 has 16 divisors (see below), whose sum is σ = 39311576640. Its totient is φ = 8663104800.

The previous prime is 21748763339. The next prime is 21748763417. The reversal of 21748763390 is 9336784712.

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, 4547561 + ... + 4552340.

It is an arithmetic number, because the mean of its divisors is an integer number (2456973540).

Almost surely, 2^21748763390 is an apocalyptic number.

21748763390 is a deficient number, since it is larger than the sum of its proper divisors (17562813250).

21748763390 is a wasteful number, since it uses less digits than its factorization.

21748763390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9100147.

The product of its (nonzero) digits is 1524096, while the sum is 50.

The spelling of 21748763390 in words is "twenty-one billion, seven hundred forty-eight million, seven hundred sixty-three thousand, three hundred ninety".