30331310221021 has 4 divisors (see below), whose sum is σ = 30331411298172. Its totient is φ = 30331209143872.

The previous prime is 30331310220931. The next prime is 30331310221031. The reversal of 30331310221021 is 12012201313303.

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 22128321605625 + 8202988615396 = 4704075^2 + 2864086^2 .

It is a cyclic number.

It is not a de Polignac number, because 30331310221021 - 2¹³ = 30331310212829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30331310220983 and 30331310221001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30331310221031) 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, 50087110 + ... + 50689063.

It is an arithmetic number, because the mean of its divisors is an integer number (7582852824543).

Almost surely, 2^{30331310221021} is an apocalyptic number.

It is an amenable number.

30331310221021 is a deficient number, since it is larger than the sum of its proper divisors (101077151).

30331310221021 is a wasteful number, since it uses less digits than its factorization.

30331310221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101077150.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 30331310221021 its reverse (12012201313303), we get a palindrome (42343511534324).

The spelling of 30331310221021 in words is "thirty trillion, three hundred thirty-one billion, three hundred ten million, two hundred twenty-one thousand, twenty-one".