30123012221 has 4 divisors (see below), whose sum is σ = 30147643872. Its totient is φ = 30098380572.

The previous prime is 30123012217. The next prime is 30123012223. The reversal of 30123012221 is 12221032103.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 30123012221 - 2² = 30123012217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 30123012221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30123012223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12313991 + ... + 12316436.

It is an arithmetic number, because the mean of its divisors is an integer number (7536910968).

Almost surely, 2^30123012221 is an apocalyptic number.

It is an amenable number.

30123012221 is a deficient number, since it is larger than the sum of its proper divisors (24631651).

30123012221 is a wasteful number, since it uses less digits than its factorization.

30123012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24631650.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 30123012221 its reverse (12221032103), we get a palindrome (42344044324).

The spelling of 30123012221 in words is "thirty billion, one hundred twenty-three million, twelve thousand, two hundred twenty-one".