201212102021 has 24 divisors (see below), whose sum is σ = 234792528120. Its totient is φ = 171930874752.

The previous prime is 201212102011. The next prime is 201212102033. The reversal of 201212102021 is 120201212102.

It can be written as a sum of positive squares in 4 ways, for example, as 49984900 + 201162117121 = 7070^2 + 448511^2 .

It is a de Polignac number, because none of the positive numbers 2^k-201212102021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201212101987 and 201212102005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201212102011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22621451 + ... + 22630343.

It is an arithmetic number, because the mean of its divisors is an integer number (9783022005).

Almost surely, 2^201212102021 is an apocalyptic number.

It is an amenable number.

201212102021 is a deficient number, since it is larger than the sum of its proper divisors (33580426099).

201212102021 is an equidigital number, since it uses as much as digits as its factorization.

201212102021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10293 (or 10286 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 201212102021 its reverse (120201212102), we get a palindrome (321413314123).

The spelling of 201212102021 in words is "two hundred one billion, two hundred twelve million, one hundred two thousand, twenty-one".