221020292 has 6 divisors (see below), whose sum is σ = 386785518. Its totient is φ = 110510144.

The previous prime is 221020279. The next prime is 221020321. The reversal of 221020292 is 292020122.

It can be written as a sum of positive squares in only one way, i.e., 220938496 + 81796 = 14864^2 + 286^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27627533 + ... + 27627540.

It is an arithmetic number, because the mean of its divisors is an integer number (64464253).

Almost surely, 2^221020292 is an apocalyptic number.

It is an amenable number.

221020292 is a deficient number, since it is larger than the sum of its proper divisors (165765226).

221020292 is a wasteful number, since it uses less digits than its factorization.

221020292 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55255077 (or 55255075 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 221020292 is about 14866.7512254695. The cubic root of 221020292 is about 604.6128634523.

The spelling of 221020292 in words is "two hundred twenty-one million, twenty thousand, two hundred ninety-two".