9151890099921 has 6 divisors (see below), whose sum is σ = 13219396811010. Its totient is φ = 6101260066608.

The previous prime is 9151890099883. The next prime is 9151890100039. The reversal of 9151890099921 is 1299900981519.

9151890099921 is a `hidden beast` number, since 9 + 1 + 518 + 9 + 0 + 0 + 9 + 99 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 7042845514896 + 2109044585025 = 2653836^2 + 1452255^2 .

It is a de Polignac number, because none of the positive numbers 2^k-9151890099921 is a prime.

It is a super-2 number, since 2×9151890099921² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9151890099221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 508438338876 + ... + 508438338893.

It is an arithmetic number, because the mean of its divisors is an integer number (2203232801835).

Almost surely, 2^{9151890099921} is an apocalyptic number.

It is an amenable number.

9151890099921 is a deficient number, since it is larger than the sum of its proper divisors (4067506711089).

9151890099921 is a wasteful number, since it uses less digits than its factorization.

9151890099921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1016876677775 (or 1016876677772 counting only the distinct ones).

The product of its (nonzero) digits is 4723920, while the sum is 63.

The spelling of 9151890099921 in words is "nine trillion, one hundred fifty-one billion, eight hundred ninety million, ninety-nine thousand, nine hundred twenty-one".