221251092 has 48 divisors (see below), whose sum is σ = 551308800. Its totient is φ = 68906880.

The previous prime is 221251081. The next prime is 221251103. The reversal of 221251092 is 290152122.

It is an interprime number because it is at equal distance from previous prime (221251081) and next prime (221251103).

It is a super-2 number, since 2×221251092² = 97904091422384928, which contains 22 as substring.

It is a congruent number.

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, 534 + ... + 21042.

It is an arithmetic number, because the mean of its divisors is an integer number (11485600).

Almost surely, 2^221251092 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221251092, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (275654400).

221251092 is an abundant number, since it is smaller than the sum of its proper divisors (330057708).

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

221251092 is a wasteful number, since it uses less digits than its factorization.

221251092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20576 (or 20574 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 221251092 is about 14874.5114877767. The cubic root of 221251092 is about 604.8232454987.

The spelling of 221251092 in words is "two hundred twenty-one million, two hundred fifty-one thousand, ninety-two".