212120122201021 has 8 divisors (see below), whose sum is σ = 219606445240920. Its totient is φ = 204645254899008.

The previous prime is 212120122201007. The next prime is 212120122201027. The reversal of 212120122201021 is 120102221021212.

It can be written as a sum of positive squares in 4 ways, for example, as 42280295428900 + 169839826772121 = 6502330^2 + 13032261^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 212120122201021 - 2¹⁷ = 212120122069949 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212120122201021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212120122201027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2863896786 + ... + 2863970851.

It is an arithmetic number, because the mean of its divisors is an integer number (27450805655115).

Almost surely, 2^{212120122201021} is an apocalyptic number.

It is an amenable number.

212120122201021 is a deficient number, since it is larger than the sum of its proper divisors (7486323039899).

212120122201021 is a wasteful number, since it uses less digits than its factorization.

212120122201021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5727868943.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 212120122201021 its reverse (120102221021212), we get a palindrome (332222343222233).

The spelling of 212120122201021 in words is "two hundred twelve trillion, one hundred twenty billion, one hundred twenty-two million, two hundred one thousand, twenty-one".