9721025851 has 4 divisors (see below), whose sum is σ = 9723076704. Its totient is φ = 9718975000.

The previous prime is 9721025843. The next prime is 9721025869. The reversal of 9721025851 is 1585201279.

9721025851 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9721025851 - 2³ = 9721025843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9721025891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1018300 + ... + 1027801.

It is an arithmetic number, because the mean of its divisors is an integer number (2430769176).

Almost surely, 2^9721025851 is an apocalyptic number.

9721025851 is a deficient number, since it is larger than the sum of its proper divisors (2050853).

9721025851 is a wasteful number, since it uses less digits than its factorization.

9721025851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2050852.

The product of its (nonzero) digits is 50400, while the sum is 40.

The square root of 9721025851 is about 98595.2628223081. The cubic root of 9721025851 is about 2134.2110591178.

The spelling of 9721025851 in words is "nine billion, seven hundred twenty-one million, twenty-five thousand, eight hundred fifty-one".