221222132 has 6 divisors (see below), whose sum is σ = 387138738. Its totient is φ = 110611064.

The previous prime is 221222123. The next prime is 221222153. The reversal of 221222132 is 231222122.

It can be written as a sum of positive squares in only one way, i.e., 215091556 + 6130576 = 14666^2 + 2476^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 221222132.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27652763 + ... + 27652770.

It is an arithmetic number, because the mean of its divisors is an integer number (64523123).

Almost surely, 2^221222132 is an apocalyptic number.

It is an amenable number.

221222132 is a deficient number, since it is larger than the sum of its proper divisors (165916606).

221222132 is a wasteful number, since it uses less digits than its factorization.

221222132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55305537 (or 55305535 counting only the distinct ones).

The product of its digits is 192, while the sum is 17.

The square root of 221222132 is about 14873.5379785712. The cubic root of 221222132 is about 604.7968555040.

Adding to 221222132 its reverse (231222122), we get a palindrome (452444254).

It can be divided in two parts, 2212 and 22132, that multiplied together give a palindrome (48955984).

The spelling of 221222132 in words is "two hundred twenty-one million, two hundred twenty-two thousand, one hundred thirty-two".