30131223121 has 4 divisors (see below), whose sum is σ = 30866131044. Its totient is φ = 29396315200.

The previous prime is 30131223077. The next prime is 30131223137. The reversal of 30131223121 is 12132213103.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18264171025 + 11867052096 = 135145^2 + 108936^2 .

It is a cyclic number.

It is not a de Polignac number, because 30131223121 - 2¹⁷ = 30131092049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30131223151) 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, 367453900 + ... + 367453981.

It is an arithmetic number, because the mean of its divisors is an integer number (7716532761).

Almost surely, 2^30131223121 is an apocalyptic number.

It is an amenable number.

30131223121 is a deficient number, since it is larger than the sum of its proper divisors (734907923).

30131223121 is an equidigital number, since it uses as much as digits as its factorization.

30131223121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 734907922.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 30131223121 its reverse (12132213103), we get a palindrome (42263436224).

The spelling of 30131223121 in words is "thirty billion, one hundred thirty-one million, two hundred twenty-three thousand, one hundred twenty-one".