12261939450 has 24 divisors (see below), whose sum is σ = 30409610208. Its totient is φ = 3269850480.

The previous prime is 12261939433. The next prime is 12261939457. The reversal of 12261939450 is 5493916221.

It is not an unprimeable number, because it can be changed into a prime (12261939457) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40872982 + ... + 40873281.

It is an arithmetic number, because the mean of its divisors is an integer number (1267067092).

Almost surely, 2^12261939450 is an apocalyptic number.

12261939450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12261939450 is an abundant number, since it is smaller than the sum of its proper divisors (18147670758).

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

12261939450 is a wasteful number, since it uses less digits than its factorization.

12261939450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81746278 (or 81746273 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 42.

The spelling of 12261939450 in words is "twelve billion, two hundred sixty-one million, nine hundred thirty-nine thousand, four hundred fifty".