890521221 has 12 divisors (see below), whose sum is σ = 1226903136. Its totient is φ = 574527960.

The previous prime is 890521213. The next prime is 890521277. The reversal of 890521221 is 122125098.

It is not a de Polignac number, because 890521221 - 2³ = 890521213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (890521721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 151561 + ... + 157326.

It is an arithmetic number, because the mean of its divisors is an integer number (102241928).

Almost surely, 2^890521221 is an apocalyptic number.

It is an amenable number.

890521221 is a deficient number, since it is larger than the sum of its proper divisors (336381915).

890521221 is a wasteful number, since it uses less digits than its factorization.

890521221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308952 (or 308921 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 890521221 is about 29841.6021855396. The cubic root of 890521221 is about 962.0879112063.

The spelling of 890521221 in words is "eight hundred ninety million, five hundred twenty-one thousand, two hundred twenty-one".