21333856730 has 16 divisors (see below), whose sum is σ = 38526032160. Its totient is φ = 8505744912.

The previous prime is 21333856727. The next prime is 21333856759. The reversal of 21333856730 is 3765833312.

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, 3471500 + ... + 3477639.

It is an arithmetic number, because the mean of its divisors is an integer number (2407877010).

Almost surely, 2^21333856730 is an apocalyptic number.

21333856730 is a deficient number, since it is larger than the sum of its proper divisors (17192175430).

21333856730 is a wasteful number, since it uses less digits than its factorization.

21333856730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6949453.

The product of its (nonzero) digits is 272160, while the sum is 41.

The spelling of 21333856730 in words is "twenty-one billion, three hundred thirty-three million, eight hundred fifty-six thousand, seven hundred thirty".