221906952 has 40 divisors (see below), whose sum is σ = 621546750. Its totient is φ = 73968768.

The previous prime is 221906941. The next prime is 221906957. The reversal of 221906952 is 259609122.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 219454596 + 2452356 = 14814^2 + 1566^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (221906957) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 170577 + ... + 171872.

Almost surely, 2^221906952 is an apocalyptic number.

It is an amenable number.

221906952 is an abundant number, since it is smaller than the sum of its proper divisors (399639798).

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

221906952 is a wasteful number, since it uses less digits than its factorization.

221906952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342467 (or 342454 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 221906952 is about 14896.5416120655. The cubic root of 221906952 is about 605.4202867040.

The spelling of 221906952 in words is "two hundred twenty-one million, nine hundred six thousand, nine hundred fifty-two".