30021031121 has 4 divisors (see below), whose sum is σ = 30659776512. Its totient is φ = 29382285732.

The previous prime is 30021031087. The next prime is 30021031123. The reversal of 30021031121 is 12113012003.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12113012003 = 12347 ⋅981049.

It is a cyclic number.

It is not a de Polignac number, because 30021031121 - 2¹⁸ = 30020768977 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30021031096 and 30021031105.

It is not an unprimeable number, because it can be changed into a prime (30021031123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 319372625 + ... + 319372718.

It is an arithmetic number, because the mean of its divisors is an integer number (7664944128).

Almost surely, 2^30021031121 is an apocalyptic number.

It is an amenable number.

30021031121 is a deficient number, since it is larger than the sum of its proper divisors (638745391).

30021031121 is an equidigital number, since it uses as much as digits as its factorization.

30021031121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638745390.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 30021031121 its reverse (12113012003), we get a palindrome (42134043124).

The spelling of 30021031121 in words is "thirty billion, twenty-one million, thirty-one thousand, one hundred twenty-one".