9721059971 has 6 divisors (see below), whose sum is σ = 11308171860. Its totient is φ = 8332337076.

The previous prime is 9721059899. The next prime is 9721059991. The reversal of 9721059971 is 1799501279.

It is a de Polignac number, because none of the positive numbers 2^k-9721059971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9721059991) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 99194441 + ... + 99194538.

It is an arithmetic number, because the mean of its divisors is an integer number (1884695310).

Almost surely, 2^9721059971 is an apocalyptic number.

9721059971 is a deficient number, since it is larger than the sum of its proper divisors (1587111889).

9721059971 is a wasteful number, since it uses less digits than its factorization.

9721059971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198388993 (or 198388986 counting only the distinct ones).

The product of its (nonzero) digits is 357210, while the sum is 50.

The square root of 9721059971 is about 98595.4358527817. The cubic root of 9721059971 is about 2134.2135560832.

The spelling of 9721059971 in words is "nine billion, seven hundred twenty-one million, fifty-nine thousand, nine hundred seventy-one".