12101221212021 has 32 divisors (see below), whose sum is σ = 18160023596800. Its totient is φ = 8062609666464.

The previous prime is 12101221211999. The next prime is 12101221212023. The reversal of 12101221212021 is 12021212210121.

12101221212021 is a `hidden beast` number, since 1 + 210 + 1 + 221 + 212 + 0 + 21 = 666.

It is not a de Polignac number, because 12101221212021 - 2¹⁹ = 12101220687733 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12101221211985 and 12101221212003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12101221212023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1954200 + ... + 5293518.

It is an arithmetic number, because the mean of its divisors is an integer number (567500737400).

Almost surely, 2^{12101221212021} is an apocalyptic number.

It is an amenable number.

12101221212021 is a deficient number, since it is larger than the sum of its proper divisors (6058802384779).

12101221212021 is an frugal number, since it uses more digits than its factorization.

12101221212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3340997 (or 3340979 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 12101221212021 its reverse (12021212210121), we get a palindrome (24122433422142).

The spelling of 12101221212021 in words is "twelve trillion, one hundred one billion, two hundred twenty-one million, two hundred twelve thousand, twenty-one".