9992909621 has 16 divisors (see below), whose sum is σ = 10834046784. Its totient is φ = 9180213504.

The previous prime is 9992909557. The next prime is 9992909701. The reversal of 9992909621 is 1269092999.

It is a cyclic number.

It is not a de Polignac number, because 9992909621 - 2⁶ = 9992909557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9992909821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1368446 + ... + 1375728.

It is an arithmetic number, because the mean of its divisors is an integer number (677127924).

Almost surely, 2^9992909621 is an apocalyptic number.

It is an amenable number.

9992909621 is a deficient number, since it is larger than the sum of its proper divisors (841137163).

9992909621 is a wasteful number, since it uses less digits than its factorization.

9992909621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9220.

The product of its (nonzero) digits is 1417176, while the sum is 56.

The square root of 9992909621 is about 99964.5418185869. The cubic root of 9992909621 is about 2153.9253776896.

The spelling of 9992909621 in words is "nine billion, nine hundred ninety-two million, nine hundred nine thousand, six hundred twenty-one".