221157030 has 16 divisors (see below), whose sum is σ = 530776944. Its totient is φ = 58975200.

The previous prime is 221157011. The next prime is 221157031. The reversal of 221157030 is 30751122.

It is a junction number, because it is equal to n+sod(n) for n = 221156988 and 221157006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221157031) 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, 3685921 + ... + 3685980.

It is an arithmetic number, because the mean of its divisors is an integer number (33173559).

Almost surely, 2^221157030 is an apocalyptic number.

221157030 is an abundant number, since it is smaller than the sum of its proper divisors (309619914).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221157030 is a wasteful number, since it uses less digits than its factorization.

221157030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7371911.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 221157030 is about 14871.3492999122. The cubic root of 221157030 is about 604.7375224594.

The spelling of 221157030 in words is "two hundred twenty-one million, one hundred fifty-seven thousand, thirty".