9906011621 has 4 divisors (see below), whose sum is σ = 10806558144. Its totient is φ = 9005465100.

The previous prime is 9906011593. The next prime is 9906011629. The reversal of 9906011621 is 1261106099.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9906011621 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 (9906011629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 450273245 + ... + 450273266.

It is an arithmetic number, because the mean of its divisors is an integer number (2701639536).

Almost surely, 2^9906011621 is an apocalyptic number.

It is an amenable number.

9906011621 is a deficient number, since it is larger than the sum of its proper divisors (900546523).

9906011621 is a wasteful number, since it uses less digits than its factorization.

9906011621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 900546522.

The product of its (nonzero) digits is 5832, while the sum is 35.

The square root of 9906011621 is about 99528.9486581668. The cubic root of 9906011621 is about 2147.6637049129.

The spelling of 9906011621 in words is "nine billion, nine hundred six million, eleven thousand, six hundred twenty-one".