1231212300 has 36 divisors (see below), whose sum is σ = 3562308456. Its totient is φ = 328323200.

The previous prime is 1231212253. The next prime is 1231212319. The reversal of 1231212300 is 32121321.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1231212300.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2051721 + ... + 2052320.

Almost surely, 2^1231212300 is an apocalyptic number.

1231212300 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231212300 is an abundant number, since it is smaller than the sum of its proper divisors (2331096156).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1231212300 is a wasteful number, since it uses less digits than its factorization.

1231212300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4104058 (or 4104051 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1231212300 is about 35088.6349121763. The cubic root of 1231212300 is about 1071.7931617628.

Adding to 1231212300 its reverse (32121321), we get a palindrome (1263333621).

It can be divided in two parts, 1231 and 212300, that added together give a triangular number (213531 = T₆₅₃).

The spelling of 1231212300 in words is "one billion, two hundred thirty-one million, two hundred twelve thousand, three hundred".