121212112021 has 64 divisors (see below), whose sum is σ = 171506958336. Its totient is φ = 82567584000.

The previous prime is 121212112019. The next prime is 121212112051. The reversal of 121212112021 is 120211212121.

It is not a de Polignac number, because 121212112021 - 2¹ = 121212112019 is a prime.

It is a super-2 number, since 2×121212112021² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121212111986 and 121212112004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121212112001) 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 63 ways as a sum of consecutive naturals, for example, 2299260 + ... + 2351386.

It is an arithmetic number, because the mean of its divisors is an integer number (2679796224).

Almost surely, 2^121212112021 is an apocalyptic number.

121212112021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121212112021 is a deficient number, since it is larger than the sum of its proper divisors (50294846315).

121212112021 is a wasteful number, since it uses less digits than its factorization.

121212112021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52282.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 121212112021 its reverse (120211212121), we get a palindrome (241423324142).

The spelling of 121212112021 in words is "one hundred twenty-one billion, two hundred twelve million, one hundred twelve thousand, twenty-one".