221770472 has 48 divisors (see below), whose sum is σ = 527692320. Its totient is φ = 86402400.

The previous prime is 221770429. The next prime is 221770477. The reversal of 221770472 is 274077122.

It is a happy number.

It is a super-2 number, since 2×221770472² = 98364284502205568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221770477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21404 + ... + 30027.

It is an arithmetic number, because the mean of its divisors is an integer number (10993590).

Almost surely, 2^221770472 is an apocalyptic number.

221770472 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

221770472 is an abundant number, since it is smaller than the sum of its proper divisors (305921848).

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

221770472 is a wasteful number, since it uses less digits than its factorization.

221770472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51462 (or 51451 counting only the distinct ones).

The product of its (nonzero) digits is 10976, while the sum is 32.

The square root of 221770472 is about 14891.9599784582. The cubic root of 221770472 is about 605.2961435209.

The spelling of 221770472 in words is "two hundred twenty-one million, seven hundred seventy thousand, four hundred seventy-two".