9021721649 has 8 divisors (see below), whose sum is σ = 9315509760. Its totient is φ = 8728106400.

The previous prime is 9021721637. The next prime is 9021721661. The reversal of 9021721649 is 9461271209.

It is an interprime number because it is at equal distance from previous prime (9021721637) and next prime (9021721661).

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

It is a cyclic number.

It is not a de Polignac number, because 9021721649 - 2²⁴ = 9004944433 is a prime.

It is a super-3 number, since 3×9021721649³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9021721669) 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, 67397 + ... + 150285.

It is an arithmetic number, because the mean of its divisors is an integer number (1164438720).

Almost surely, 2^9021721649 is an apocalyptic number.

It is an amenable number.

9021721649 is a deficient number, since it is larger than the sum of its proper divisors (293788111).

9021721649 is a wasteful number, since it uses less digits than its factorization.

9021721649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86431.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 9021721649 is about 94982.7439538362. The cubic root of 9021721649 is about 2081.7559174780.

The spelling of 9021721649 in words is "nine billion, twenty-one million, seven hundred twenty-one thousand, six hundred forty-nine".