30221020121 has 12 divisors (see below), whose sum is σ = 30944601900. Its totient is φ = 29511388800.

The previous prime is 30221020097. The next prime is 30221020183. The reversal of 30221020121 is 12102012203.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 7219051225 + 23001968896 = 84965^2 + 151664^2 .

It is not a de Polignac number, because 30221020121 - 2³⁴ = 13041150937 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30221020096 and 30221020105.

It is not an unprimeable number, because it can be changed into a prime (30221028121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 510155 + ... + 566303.

It is an arithmetic number, because the mean of its divisors is an integer number (2578716825).

Almost surely, 2^30221020121 is an apocalyptic number.

It is an amenable number.

30221020121 is a deficient number, since it is larger than the sum of its proper divisors (723581779).

30221020121 is an equidigital number, since it uses as much as digits as its factorization.

30221020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56396 (or 56323 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 30221020121 its reverse (12102012203), we get a palindrome (42323032324).

The spelling of 30221020121 in words is "thirty billion, two hundred twenty-one million, twenty thousand, one hundred twenty-one".