221374290 has 32 divisors (see below), whose sum is σ = 531691776. Its totient is φ = 58989440.

The previous prime is 221374271. The next prime is 221374303. The reversal of 221374290 is 92473122.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71719 + ... + 74741.

It is an arithmetic number, because the mean of its divisors is an integer number (16615368).

Almost surely, 2^221374290 is an apocalyptic number.

221374290 is an abundant number, since it is smaller than the sum of its proper divisors (310317486).

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

221374290 is a wasteful number, since it uses less digits than its factorization.

221374290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5474.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 221374290 is about 14878.6521566975. The cubic root of 221374290 is about 604.9354847764.

The spelling of 221374290 in words is "two hundred twenty-one million, three hundred seventy-four thousand, two hundred ninety".