121212012021 has 16 divisors (see below), whose sum is σ = 163670545920. Its totient is φ = 79782021360.

The previous prime is 121212011989. The next prime is 121212012029. The reversal of 121212012021 is 120210212121.

It is not a de Polignac number, because 121212012021 - 2⁵ = 121212011989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121212012029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 222240 + ... + 540198.

It is an arithmetic number, because the mean of its divisors is an integer number (10229409120).

Almost surely, 2^121212012021 is an apocalyptic number.

It is an amenable number.

121212012021 is a deficient number, since it is larger than the sum of its proper divisors (42458533899).

121212012021 is a wasteful number, since it uses less digits than its factorization.

121212012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319576.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 121212012021 its reverse (120210212121), we get a palindrome (241422224142).

The spelling of 121212012021 in words is "one hundred twenty-one billion, two hundred twelve million, twelve thousand, twenty-one".