131221222 has 16 divisors (see below), whose sum is σ = 215469072. Its totient is φ = 59439520.

The previous prime is 131221213. The next prime is 131221229. The reversal of 131221222 is 222122131.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 131221196 and 131221205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131221229) 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, 3733 + ... + 16624.

It is an arithmetic number, because the mean of its divisors is an integer number (13466817).

Almost surely, 2^131221222 is an apocalyptic number.

131221222 is a deficient number, since it is larger than the sum of its proper divisors (84247850).

131221222 is a wasteful number, since it uses less digits than its factorization.

131221222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20663.

The product of its digits is 96, while the sum is 16.

The square root of 131221222 is about 11455.1831936464. The cubic root of 131221222 is about 508.1610330203.

Adding to 131221222 its reverse (222122131), we get a palindrome (353343353).

Subtracting 131221222 from its reverse (222122131), we obtain a palindrome (90900909).

The spelling of 131221222 in words is "one hundred thirty-one million, two hundred twenty-one thousand, two hundred twenty-two".