30121311231 has 48 divisors (see below), whose sum is σ = 49919680512. Its totient is φ = 17333035200.

The previous prime is 30121311217. The next prime is 30121311239. The reversal of 30121311231 is 13211312103.

30121311231 is a `hidden beast` number, since 3 + 0 + 121 + 311 + 231 = 666.

It is not a de Polignac number, because 30121311231 - 2¹⁰ = 30121310207 is a prime.

It is a super-2 number, since 2×30121311231² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30121311239) 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, 70066 + ... + 255248.

It is an arithmetic number, because the mean of its divisors is an integer number (1039993344).

Almost surely, 2^30121311231 is an apocalyptic number.

30121311231 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

30121311231 is a deficient number, since it is larger than the sum of its proper divisors (19798369281).

30121311231 is a wasteful number, since it uses less digits than its factorization.

30121311231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185284 (or 185281 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 30121311231 its reverse (13211312103), we get a palindrome (43332623334).

The spelling of 30121311231 in words is "thirty billion, one hundred twenty-one million, three hundred eleven thousand, two hundred thirty-one".