30121021331021 has 4 divisors (see below), whose sum is σ = 31706338243200. Its totient is φ = 28535704418844.

The previous prime is 30121021330999. The next prime is 30121021331053. The reversal of 30121021331021 is 12013312012103.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 30121021331021 - 2⁶ = 30121021330957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30121021330984 and 30121021331002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30121021334021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 792658456061 + ... + 792658456098.

It is an arithmetic number, because the mean of its divisors is an integer number (7926584560800).

Almost surely, 2^{30121021331021} is an apocalyptic number.

It is an amenable number.

30121021331021 is a deficient number, since it is larger than the sum of its proper divisors (1585316912179).

30121021331021 is a wasteful number, since it uses less digits than its factorization.

30121021331021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1585316912178.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 30121021331021 its reverse (12013312012103), we get a palindrome (42134333343124).

The spelling of 30121021331021 in words is "thirty trillion, one hundred twenty-one billion, twenty-one million, three hundred thirty-one thousand, twenty-one".