9721511042 has 4 divisors (see below), whose sum is σ = 14582266566. Its totient is φ = 4860755520.

The previous prime is 9721511027. The next prime is 9721511053. The reversal of 9721511042 is 2401151279.

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

It can be written as a sum of positive squares in only one way, i.e., 8898337561 + 823173481 = 94331^2 + 28691^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2430377759 + ... + 2430377762.

Almost surely, 2^9721511042 is an apocalyptic number.

9721511042 is a deficient number, since it is larger than the sum of its proper divisors (4860755524).

9721511042 is a wasteful number, since it uses less digits than its factorization.

9721511042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4860755523.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 9721511042 is about 98597.7233104294. The cubic root of 9721511042 is about 2134.2465657535.

The spelling of 9721511042 in words is "nine billion, seven hundred twenty-one million, five hundred eleven thousand, forty-two".