201021221212210 has 48 divisors (see below), whose sum is σ = 422720319706776. Its totient is φ = 68625760826112.

The previous prime is 201021221212193. The next prime is 201021221212223. The reversal of 201021221212210 is 12212122120102.

It can be written as a sum of positive squares in 4 ways, for example, as 149258045528641 + 51763175683569 = 12217121^2 + 7194663^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 880245037 + ... + 880473376.

Almost surely, 2^{201021221212210} is an apocalyptic number.

201021221212210 is an abundant number, since it is smaller than the sum of its proper divisors (221699098494566).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

201021221212210 is a wasteful number, since it uses less digits than its factorization.

201021221212210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1760718667 (or 1760718660 counting only the distinct ones).

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

Adding to 201021221212210 its reverse (12212122120102), we get a palindrome (213233343332312).

The spelling of 201021221212210 in words is "two hundred one trillion, twenty-one billion, two hundred twenty-one million, two hundred twelve thousand, two hundred ten".