211221201010 has 128 divisors (see below), whose sum is σ = 427647729600. Its totient is φ = 74720378880.

The previous prime is 211221200977. The next prime is 211221201041. The reversal of 211221201010 is 10102122112.

It can be written as a sum of positive squares in 32 ways, for example, as 52461049 + 211168739961 = 7243^2 + 459531^2 .

It is a super-2 number, since 2×211221201010² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 102883144 + ... + 102885196.

Almost surely, 2^211221201010 is an apocalyptic number.

211221201010 is an abundant number, since it is smaller than the sum of its proper divisors (216426528590).

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

211221201010 is a wasteful number, since it uses less digits than its factorization.

211221201010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2656.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 211221201010 its reverse (10102122112), we get a palindrome (221323323122).

The spelling of 211221201010 in words is "two hundred eleven billion, two hundred twenty-one million, two hundred one thousand, ten".