30123312021 has 48 divisors (see below), whose sum is σ = 49338132480. Its totient is φ = 18214625520.

The previous prime is 30123312019. The next prime is 30123312047. The reversal of 30123312021 is 12021332103.

It is not a de Polignac number, because 30123312021 - 2¹ = 30123312019 is a prime.

It is a super-2 number, since 2×30123312021² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 30123311985 and 30123312003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30123311021) 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, 1171420 + ... + 1196858.

It is an arithmetic number, because the mean of its divisors is an integer number (1027877760).

Almost surely, 2^30123312021 is an apocalyptic number.

It is an amenable number.

30123312021 is a deficient number, since it is larger than the sum of its proper divisors (19214820459).

30123312021 is a wasteful number, since it uses less digits than its factorization.

30123312021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25908 (or 25896 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 30123312021 its reverse (12021332103), we get a palindrome (42144644124).

The spelling of 30123312021 in words is "thirty billion, one hundred twenty-three million, three hundred twelve thousand, twenty-one".