30121111031 has 4 divisors (see below), whose sum is σ = 32859393864. Its totient is φ = 27382828200.

The previous prime is 30121111019. The next prime is 30121111049. The reversal of 30121111031 is 13011112103.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13011112103 = 11 ⋅1182828373.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30121111031 is a prime.

It is a super-2 number, since 2×30121111031² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 30121110997 and 30121111015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30121111001) 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, 1369141400 + ... + 1369141421.

It is an arithmetic number, because the mean of its divisors is an integer number (8214848466).

Almost surely, 2^30121111031 is an apocalyptic number.

30121111031 is a deficient number, since it is larger than the sum of its proper divisors (2738282833).

30121111031 is a wasteful number, since it uses less digits than its factorization.

30121111031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2738282832.

The product of its (nonzero) digits is 18, while the sum is 14.

Adding to 30121111031 its reverse (13011112103), we get a palindrome (43132223134).

The spelling of 30121111031 in words is "thirty billion, one hundred twenty-one million, one hundred eleven thousand, thirty-one".