12921953450 has 24 divisors (see below), whose sum is σ = 27468381792. Its totient is φ = 4430383920.

The previous prime is 12921953437. The next prime is 12921953461. The reversal of 12921953450 is 5435912921.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12921953398 and 12921953407.

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, 18459584 + ... + 18460283.

It is an arithmetic number, because the mean of its divisors is an integer number (1144515908).

Almost surely, 2^12921953450 is an apocalyptic number.

12921953450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12921953450 is an abundant number, since it is smaller than the sum of its proper divisors (14546428342).

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

12921953450 is a wasteful number, since it uses less digits than its factorization.

12921953450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36919886 (or 36919881 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 41.

The spelling of 12921953450 in words is "twelve billion, nine hundred twenty-one million, nine hundred fifty-three thousand, four hundred fifty".