201212002121221 has 12 divisors (see below), whose sum is σ = 252067782877932. Its totient is φ = 159200704974528.

The previous prime is 201212002121201. The next prime is 201212002121227. The reversal of 201212002121221 is 122121200212102.

It can be written as a sum of positive squares in 2 ways, for example, as 64813545070596 + 136398457050625 = 8050686^2 + 11678975^2 .

It is not a de Polignac number, because 201212002121221 - 2⁹ = 201212002120709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201212002121227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 157937206680 + ... + 157937207953.

It is an arithmetic number, because the mean of its divisors is an integer number (21005648573161).

Almost surely, 2^{201212002121221} is an apocalyptic number.

It is an amenable number.

201212002121221 is a deficient number, since it is larger than the sum of its proper divisors (50855780756711).

201212002121221 is a wasteful number, since it uses less digits than its factorization.

201212002121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315874414660 (or 315874414653 counting only the distinct ones).

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

Adding to 201212002121221 its reverse (122121200212102), we get a palindrome (323333202333323).

The spelling of 201212002121221 in words is "two hundred one trillion, two hundred twelve billion, two million, one hundred twenty-one thousand, two hundred twenty-one".