30121021331 has 4 divisors (see below), whose sum is σ = 30246005064. Its totient is φ = 29996037600.

The previous prime is 30121021313. The next prime is 30121021339. The reversal of 30121021331 is 13312012103.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30121021331 is a prime.

It is a super-2 number, since 2×30121021331² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30121021339) 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, 62491505 + ... + 62491986.

It is an arithmetic number, because the mean of its divisors is an integer number (7561501266).

Almost surely, 2^30121021331 is an apocalyptic number.

30121021331 is a deficient number, since it is larger than the sum of its proper divisors (124983733).

30121021331 is a wasteful number, since it uses less digits than its factorization.

30121021331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124983732.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 30121021331 its reverse (13312012103), we get a palindrome (43433033434).

The spelling of 30121021331 in words is "thirty billion, one hundred twenty-one million, twenty-one thousand, three hundred thirty-one".