1221431023 has 8 divisors (see below), whose sum is σ = 1229284080. Its totient is φ = 1213589760.

The previous prime is 1221431021. The next prime is 1221431027. The reversal of 1221431023 is 3201341221.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221431023 - 2¹ = 1221431021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221431021) 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, 301753 + ... + 305773.

It is an arithmetic number, because the mean of its divisors is an integer number (153660510).

Almost surely, 2^1221431023 is an apocalyptic number.

1221431023 is a deficient number, since it is larger than the sum of its proper divisors (7853057).

1221431023 is a wasteful number, since it uses less digits than its factorization.

1221431023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5897.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 1221431023 is about 34948.9774242395. The cubic root of 1221431023 is about 1068.9473512282.

Adding to 1221431023 its reverse (3201341221), we get a palindrome (4422772244).

The spelling of 1221431023 in words is "one billion, two hundred twenty-one million, four hundred thirty-one thousand, twenty-three".