12451356621 has 48 divisors (see below), whose sum is σ = 21042815040. Its totient is φ = 7014159360.

The previous prime is 12451356601. The next prime is 12451356629. The reversal of 12451356621 is 12665315421.

12451356621 is a `hidden beast` number, since 1 + 24 + 5 + 1 + 3 + 5 + 6 + 621 = 666.

It is not a de Polignac number, because 12451356621 - 2⁷ = 12451356493 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12451356629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 37245 + ... + 162141.

It is an arithmetic number, because the mean of its divisors is an integer number (438391980).

Almost surely, 2^12451356621 is an apocalyptic number.

12451356621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12451356621 is a deficient number, since it is larger than the sum of its proper divisors (8591458419).

12451356621 is a wasteful number, since it uses less digits than its factorization.

12451356621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124986 (or 124983 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The spelling of 12451356621 in words is "twelve billion, four hundred fifty-one million, three hundred fifty-six thousand, six hundred twenty-one".