121212032021 has 4 divisors (see below), whose sum is σ = 121268648844. Its totient is φ = 121155415200.

The previous prime is 121212032009. The next prime is 121212032063. The reversal of 121212032021 is 120230212121.

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 91756891396 + 29455140625 = 302914^2 + 171625^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121212032021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121212032321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28305200 + ... + 28309481.

It is an arithmetic number, because the mean of its divisors is an integer number (30317162211).

Almost surely, 2^121212032021 is an apocalyptic number.

It is an amenable number.

121212032021 is a deficient number, since it is larger than the sum of its proper divisors (56616823).

121212032021 is an equidigital number, since it uses as much as digits as its factorization.

121212032021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56616822.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 121212032021 its reverse (120230212121), we get a palindrome (241442244142).

The spelling of 121212032021 in words is "one hundred twenty-one billion, two hundred twelve million, thirty-two thousand, twenty-one".