221081022 has 32 divisors (see below), whose sum is σ = 520192800. Its totient is φ = 69358464.

The previous prime is 221081009. The next prime is 221081027. The reversal of 221081022 is 220180122.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 221080986 and 221081004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221081027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 119497 + ... + 121332.

It is an arithmetic number, because the mean of its divisors is an integer number (16256025).

Almost surely, 2^221081022 is an apocalyptic number.

221081022 is an abundant number, since it is smaller than the sum of its proper divisors (299111778).

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

221081022 is a wasteful number, since it uses less digits than its factorization.

221081022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240857 (or 240851 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 221081022 is about 14868.7935623574. The cubic root of 221081022 is about 604.6682351052.

The spelling of 221081022 in words is "two hundred twenty-one million, eighty-one thousand, twenty-two".