221331054 has 16 divisors (see below), whose sum is σ = 505899648. Its totient is φ = 63237432.

The previous prime is 221331053. The next prime is 221331091. The reversal of 221331054 is 450133122.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 221331054.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221331053) 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, 2634852 + ... + 2634935.

It is an arithmetic number, because the mean of its divisors is an integer number (31618728).

Almost surely, 2^221331054 is an apocalyptic number.

221331054 is an abundant number, since it is smaller than the sum of its proper divisors (284568594).

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

221331054 is a wasteful number, since it uses less digits than its factorization.

221331054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5269799.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 221331054 is about 14877.1991315570. The cubic root of 221331054 is about 604.8960994537.

Adding to 221331054 its reverse (450133122), we get a palindrome (671464176).

The spelling of 221331054 in words is "two hundred twenty-one million, three hundred thirty-one thousand, fifty-four".