30000012021 has 12 divisors (see below), whose sum is σ = 49523829472. Its totient is φ = 17142863976.

The previous prime is 30000012011. The next prime is 30000012023. The reversal of 30000012021 is 12021000003.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-30000012021 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30000011994 and 30000012012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30000012023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 238095271 + ... + 238095396.

Almost surely, 2^30000012021 is an apocalyptic number.

It is an amenable number.

30000012021 is a deficient number, since it is larger than the sum of its proper divisors (19523817451).

30000012021 is a wasteful number, since it uses less digits than its factorization.

30000012021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476190680 (or 476190677 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

Adding to 30000012021 its reverse (12021000003), we get a palindrome (42021012024).

The spelling of 30000012021 in words is "thirty billion, twelve thousand, twenty-one".