30000991221 has 16 divisors (see below), whose sum is σ = 44945308800. Its totient is φ = 19775932704.

The previous prime is 30000991219. The next prime is 30000991297. The reversal of 30000991221 is 12219900003.

It is not a de Polignac number, because 30000991221 - 2¹ = 30000991219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30000991201) 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, 6240001 + ... + 6244806.

It is an arithmetic number, because the mean of its divisors is an integer number (2809081800).

Almost surely, 2^30000991221 is an apocalyptic number.

It is an amenable number.

30000991221 is a deficient number, since it is larger than the sum of its proper divisors (14944317579).

30000991221 is a wasteful number, since it uses less digits than its factorization.

30000991221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12484905 (or 12484899 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The spelling of 30000991221 in words is "thirty billion, nine hundred ninety-one thousand, two hundred twenty-one".