9721425553 has 8 divisors (see below), whose sum is σ = 11117986880. Its totient is φ = 8326810800.

The previous prime is 9721425463. The next prime is 9721425557. The reversal of 9721425553 is 3555241279.

It is a happy number.

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

It is not a de Polignac number, because 9721425553 - 2¹⁷ = 9721294481 is a prime.

It is a super-2 number, since 2×9721425553² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (9721425557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 475923 + ... + 495928.

It is an arithmetic number, because the mean of its divisors is an integer number (1389748360).

Almost surely, 2^9721425553 is an apocalyptic number.

It is an amenable number.

9721425553 is a deficient number, since it is larger than the sum of its proper divisors (1396561327).

9721425553 is a wasteful number, since it uses less digits than its factorization.

9721425553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 973287.

The product of its digits is 378000, while the sum is 43.

The square root of 9721425553 is about 98597.2897852674. The cubic root of 9721425553 is about 2134.2403096911.

The spelling of 9721425553 in words is "nine billion, seven hundred twenty-one million, four hundred twenty-five thousand, five hundred fifty-three".