221015290 has 8 divisors (see below), whose sum is σ = 397827540. Its totient is φ = 88406112.

The previous prime is 221015287. The next prime is 221015309. The reversal of 221015290 is 92510122.

It can be written as a sum of positive squares in 2 ways, for example, as 180552969 + 40462321 = 13437^2 + 6361^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11050755 + ... + 11050774.

Almost surely, 2^221015290 is an apocalyptic number.

221015290 is a deficient number, since it is larger than the sum of its proper divisors (176812250).

221015290 is a wasteful number, since it uses less digits than its factorization.

221015290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22101536.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 221015290 is about 14866.5829967750. The cubic root of 221015290 is about 604.6083023382.

The spelling of 221015290 in words is "two hundred twenty-one million, fifteen thousand, two hundred ninety".