30321122021 has 4 divisors (see below), whose sum is σ = 32104717452. Its totient is φ = 28537526592.

The previous prime is 30321122003. The next prime is 30321122053. The reversal of 30321122021 is 12022112303.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12022112303 = 229 ⋅52498307.

It can be written as a sum of positive squares in 2 ways, for example, as 14724609025 + 15596512996 = 121345^2 + 124886^2 .

It is a cyclic number.

It is not a de Polignac number, because 30321122021 - 2²² = 30316927717 is a prime.

It is a super-2 number, since 2×30321122021² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 1783595413 = 30321122021 / (3 + 0 + 3 + 2 + 1 + 1 + 2 + 2 + 0 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30321122081) 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, 891797690 + ... + 891797723.

It is an arithmetic number, because the mean of its divisors is an integer number (8026179363).

Almost surely, 2^30321122021 is an apocalyptic number.

It is an amenable number.

30321122021 is a deficient number, since it is larger than the sum of its proper divisors (1783595431).

30321122021 is a wasteful number, since it uses less digits than its factorization.

30321122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1783595430.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 30321122021 its reverse (12022112303), we get a palindrome (42343234324).

The spelling of 30321122021 in words is "thirty billion, three hundred twenty-one million, one hundred twenty-two thousand, twenty-one".