10721128725 has 36 divisors (see below), whose sum is σ = 19649325696. Its totient is φ = 5584955040.

The previous prime is 10721128699. The next prime is 10721128729. The reversal of 10721128725 is 52782112701.

It is not a de Polignac number, because 10721128725 - 2⁷ = 10721128597 is a prime.

It is a super-2 number, since 2×10721128725² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 10721128725.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10721128729) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 544389 + ... + 563738.

Almost surely, 2^10721128725 is an apocalyptic number.

10721128725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

10721128725 is a deficient number, since it is larger than the sum of its proper divisors (8928196971).

10721128725 is a wasteful number, since it uses less digits than its factorization.

10721128725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1108186 (or 1108178 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 36.

The spelling of 10721128725 in words is "ten billion, seven hundred twenty-one million, one hundred twenty-eight thousand, seven hundred twenty-five".