1221222431 has 16 divisors (see below), whose sum is σ = 1438915968. Its totient is φ = 1021807200.

The previous prime is 1221222427. The next prime is 1221222439. The reversal of 1221222431 is 1342221221.

It is a cyclic number.

It is not a de Polignac number, because 1221222431 - 2² = 1221222427 is a prime.

It is a super-2 number, since 2×1221222431² = 2982768451955099522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221222439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37316 + ... + 61926.

It is an arithmetic number, because the mean of its divisors is an integer number (89932248).

Almost surely, 2^1221222431 is an apocalyptic number.

1221222431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1221222431 is a deficient number, since it is larger than the sum of its proper divisors (217693537).

1221222431 is a wasteful number, since it uses less digits than its factorization.

1221222431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24982.

The product of its digits is 384, while the sum is 20.

The square root of 1221222431 is about 34945.9930607216. The cubic root of 1221222431 is about 1068.8864973184.

Adding to 1221222431 its reverse (1342221221), we get a palindrome (2563443652).

It can be divided in two parts, 12212 and 22431, that added together give a palindrome (34643).

The spelling of 1221222431 in words is "one billion, two hundred twenty-one million, two hundred twenty-two thousand, four hundred thirty-one".