221000690 has 8 divisors (see below), whose sum is σ = 397801260. Its totient is φ = 88400272.

The previous prime is 221000657. The next prime is 221000699. The reversal of 221000690 is 96000122.

It can be written as a sum of positive squares in 2 ways, for example, as 219662041 + 1338649 = 14821^2 + 1157^2 .

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

It is a super-2 number, since 2×221000690² = 97682609960952200, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221000699) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11050025 + ... + 11050044.

Almost surely, 2^221000690 is an apocalyptic number.

221000690 is a deficient number, since it is larger than the sum of its proper divisors (176800570).

221000690 is a wasteful number, since it uses less digits than its factorization.

221000690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22100076.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 221000690 is about 14866.0919545118. The cubic root of 221000690 is about 604.5949888164.

The spelling of 221000690 in words is "two hundred twenty-one million, six hundred ninety", and thus it is an aban number.