201222121000 has 32 divisors (see below), whose sum is σ = 470859765480. Its totient is φ = 80488848000.

The previous prime is 201222120989. The next prime is 201222121021. The reversal of 201222121000 is 121222102.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 61075213956 + 140146907044 = 247134^2 + 374362^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100610061 + ... + 100612060.

Almost surely, 2^201222121000 is an apocalyptic number.

201222121000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201222121000 is an abundant number, since it is smaller than the sum of its proper divisors (269637644480).

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

201222121000 is a wasteful number, since it uses less digits than its factorization.

201222121000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201222142 (or 201222128 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 201222121000 its reverse (121222102), we get a palindrome (201343343102).

The spelling of 201222121000 in words is "two hundred one billion, two hundred twenty-two million, one hundred twenty-one thousand".