12505070721 has 64 divisors (see below), whose sum is σ = 20565135360. Its totient is φ = 6650730240.

The previous prime is 12505070719. The next prime is 12505070731. The reversal of 12505070721 is 12707050521.

It is not a de Polignac number, because 12505070721 - 2¹ = 12505070719 is a prime.

It is a super-2 number, since 2×12505070721² (a number of 21 digits) contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (12505070731) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1643995 + ... + 1651583.

It is an arithmetic number, because the mean of its divisors is an integer number (321330240).

Almost surely, 2^12505070721 is an apocalyptic number.

12505070721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12505070721 is a deficient number, since it is larger than the sum of its proper divisors (8060064639).

12505070721 is a wasteful number, since it uses less digits than its factorization.

12505070721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7806.

The product of its (nonzero) digits is 4900, while the sum is 30.

The spelling of 12505070721 in words is "twelve billion, five hundred five million, seventy thousand, seven hundred twenty-one".