30000123021 has 48 divisors (see below), whose sum is σ = 45243152640. Its totient is φ = 17661072000.

The previous prime is 30000123019. The next prime is 30000123061. The reversal of 30000123021 is 12032100003.

It is a happy number.

It is not a de Polignac number, because 30000123021 - 2¹ = 30000123019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 30000122988 and 30000123006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30000123001) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1935420 + ... + 1950858.

It is an arithmetic number, because the mean of its divisors is an integer number (942565680).

Almost surely, 2^30000123021 is an apocalyptic number.

It is an amenable number.

30000123021 is a deficient number, since it is larger than the sum of its proper divisors (15243029619).

30000123021 is a wasteful number, since it uses less digits than its factorization.

30000123021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15618 (or 15607 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 12.

Adding to 30000123021 its reverse (12032100003), we get a palindrome (42032223024).

The spelling of 30000123021 in words is "thirty billion, one hundred twenty-three thousand, twenty-one".