21708453370 has 16 divisors (see below), whose sum is σ = 39237358248. Its totient is φ = 8647349760.

The previous prime is 21708453323. The next prime is 21708453383. The reversal of 21708453370 is 7335480712.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 13599991161 + 8108462209 = 116619^2 + 90047^2 .

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, 4501419 + ... + 4506238.

Almost surely, 2^21708453370 is an apocalyptic number.

21708453370 is a deficient number, since it is larger than the sum of its proper divisors (17528904878).

21708453370 is a wasteful number, since it uses less digits than its factorization.

21708453370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9007905.

The product of its (nonzero) digits is 141120, while the sum is 40.

The spelling of 21708453370 in words is "twenty-one billion, seven hundred eight million, four hundred fifty-three thousand, three hundred seventy".