1231213402 has 8 divisors (see below), whose sum is σ = 1847072736. Its totient is φ = 615522492.

The previous prime is 1231213393. The next prime is 1231213411. The reversal of 1231213402 is 2043121321.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1231213393) and next prime (1231213411).

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

It is a self number, because there is not a number n which added to its sum of digits gives 1231213402.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21888 + ... + 54235.

It is an arithmetic number, because the mean of its divisors is an integer number (230884092).

Almost surely, 2^1231213402 is an apocalyptic number.

1231213402 is a deficient number, since it is larger than the sum of its proper divisors (615859334).

1231213402 is an equidigital number, since it uses as much as digits as its factorization.

1231213402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84212.

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

The square root of 1231213402 is about 35088.6506152630. The cubic root of 1231213402 is about 1071.7934815332.

Adding to 1231213402 its reverse (2043121321), we get a palindrome (3274334723).

The spelling of 1231213402 in words is "one billion, two hundred thirty-one million, two hundred thirteen thousand, four hundred two".