221704746920 has 16 divisors (see below), whose sum is σ = 498835680660. Its totient is φ = 88681898752.

The previous prime is 221704746841. The next prime is 221704746931. The reversal of 221704746920 is 29647407122.

It can be written as a sum of positive squares in 2 ways, for example, as 181198354276 + 40506392644 = 425674^2 + 201262^2 .

It is a super-2 number, since 2×221704746920² (a number of 23 digits) contains 22 as substring.

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, 2771309297 + ... + 2771309376.

Almost surely, 2^221704746920 is an apocalyptic number.

221704746920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221704746920 is an abundant number, since it is smaller than the sum of its proper divisors (277130933740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221704746920 is a wasteful number, since it uses less digits than its factorization.

221704746920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5542618684 (or 5542618680 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 44.

The spelling of 221704746920 in words is "two hundred twenty-one billion, seven hundred four million, seven hundred forty-six thousand, nine hundred twenty".