121220300030021 has 4 divisors (see below), whose sum is σ = 121250179329132. Its totient is φ = 121190420730912.

The previous prime is 121220300030017. The next prime is 121220300030041. The reversal of 121220300030021 is 120030003022121.

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 69771957467521 + 51448342562500 = 8352961^2 + 7172750^2 .

It is a cyclic number.

It is not a de Polignac number, because 121220300030021 - 2² = 121220300030017 is a prime.

It is a super-2 number, since 2×121220300030021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220300030041) 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, 14939643470 + ... + 14939651583.

It is an arithmetic number, because the mean of its divisors is an integer number (30312544832283).

Almost surely, 2^{121220300030021} is an apocalyptic number.

It is an amenable number.

121220300030021 is a deficient number, since it is larger than the sum of its proper divisors (29879299111).

121220300030021 is an equidigital number, since it uses as much as digits as its factorization.

121220300030021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29879299110.

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

Adding to 121220300030021 its reverse (120030003022121), we get a palindrome (241250303052142).

The spelling of 121220300030021 in words is "one hundred twenty-one trillion, two hundred twenty billion, three hundred million, thirty thousand, twenty-one".