1212123231 has 32 divisors (see below), whose sum is σ = 1961130240. Its totient is φ = 733816800.

The previous prime is 1212123223. The next prime is 1212123247. The reversal of 1212123231 is 1323212121.

It is not a de Polignac number, because 1212123231 - 2³ = 1212123223 is a prime.

It is a super-2 number, since 2×1212123231² = 2938485454259758722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212123271) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 379461 + ... + 382641.

It is an arithmetic number, because the mean of its divisors is an integer number (61285320).

Almost surely, 2^1212123231 is an apocalyptic number.

1212123231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1212123231 is a deficient number, since it is larger than the sum of its proper divisors (749007009).

1212123231 is a wasteful number, since it uses less digits than its factorization.

1212123231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4484 (or 4478 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 1212123231 is about 34815.5601850667. The cubic root of 1212123231 is about 1066.2251562201.

Adding to 1212123231 its reverse (1323212121), we get a palindrome (2535335352).

The spelling of 1212123231 in words is "one billion, two hundred twelve million, one hundred twenty-three thousand, two hundred thirty-one".