220835921 has 8 divisors (see below), whose sum is σ = 225450600. Its totient is φ = 216253440.

The previous prime is 220835911. The next prime is 220835941. The reversal of 220835921 is 129538022.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 640000 + 220195921 = 800^2 + 14839^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220835921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220835911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6065 + ... + 21873.

It is an arithmetic number, because the mean of its divisors is an integer number (28181325).

Almost surely, 2^220835921 is an apocalyptic number.

It is an amenable number.

220835921 is a deficient number, since it is larger than the sum of its proper divisors (4614679).

220835921 is a wasteful number, since it uses less digits than its factorization.

220835921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16099.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 220835921 is about 14860.5491486688. The cubic root of 220835921 is about 604.4446977636. Note that the first 3 decimals are identical.

The spelling of 220835921 in words is "two hundred twenty million, eight hundred thirty-five thousand, nine hundred twenty-one".