201212221201021 has 8 divisors (see below), whose sum is σ = 203412623668920. Its totient is φ = 199022423083008.

The previous prime is 201212221201007. The next prime is 201212221201051. The reversal of 201212221201021 is 120102122212102.

It can be written as a sum of positive squares in 4 ways, for example, as 15293269456921 + 185918951744100 = 3910661^2 + 13635210^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 201212221201021 - 2²⁷ = 201212086983293 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 201212221201021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201212221201051) 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, 2651049316 + ... + 2651125213.

It is an arithmetic number, because the mean of its divisors is an integer number (25426577958615).

Almost surely, 2^{201212221201021} is an apocalyptic number.

It is an amenable number.

201212221201021 is a deficient number, since it is larger than the sum of its proper divisors (2200402467899).

201212221201021 is a wasteful number, since it uses less digits than its factorization.

201212221201021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5302174943.

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

Adding to 201212221201021 its reverse (120102122212102), we get a palindrome (321314343413123).

The spelling of 201212221201021 in words is "two hundred one trillion, two hundred twelve billion, two hundred twenty-one million, two hundred one thousand, twenty-one".