30311201021 has 4 divisors (see below), whose sum is σ = 30579441852. Its totient is φ = 30042960192.

The previous prime is 30311201003. The next prime is 30311201029. The reversal of 30311201021 is 12010211303.

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 11926824100 + 18384376921 = 109210^2 + 135589^2 .

It is a cyclic number.

It is not a de Polignac number, because 30311201021 - 2¹⁸ = 30310938877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30311200987 and 30311201005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30311201029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134120246 + ... + 134120471.

It is an arithmetic number, because the mean of its divisors is an integer number (7644860463).

Almost surely, 2^30311201021 is an apocalyptic number.

It is an amenable number.

30311201021 is a deficient number, since it is larger than the sum of its proper divisors (268240831).

30311201021 is a wasteful number, since it uses less digits than its factorization.

30311201021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268240830.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 30311201021 its reverse (12010211303), we get a palindrome (42321412324).

The spelling of 30311201021 in words is "thirty billion, three hundred eleven million, two hundred one thousand, twenty-one".