10197725721 has 8 divisors (see below), whose sum is σ = 13737142944. Its totient is φ = 6728396160.

The previous prime is 10197725693. The next prime is 10197725737. The reversal of 10197725721 is 12752779101.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 10197725721 - 2²⁶ = 10130616857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (10197725761) 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 7 ways as a sum of consecutive naturals, for example, 17521575 + ... + 17522156.

It is an arithmetic number, because the mean of its divisors is an integer number (1717142868).

Almost surely, 2^10197725721 is an apocalyptic number.

It is an amenable number.

10197725721 is a deficient number, since it is larger than the sum of its proper divisors (3539417223).

10197725721 is an equidigital number, since it uses as much as digits as its factorization.

10197725721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35043831.

The product of its (nonzero) digits is 61740, while the sum is 42.

The spelling of 10197725721 in words is "ten billion, one hundred ninety-seven million, seven hundred twenty-five thousand, seven hundred twenty-one".