211221011010 has 32 divisors (see below), whose sum is σ = 506943682560. Its totient is φ = 56324130048.

The previous prime is 211221010999. The next prime is 211221011017. The reversal of 211221011010 is 10110122112.

211221011010 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×211221011010² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (211221011017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1560831 + ... + 1690749.

It is an arithmetic number, because the mean of its divisors is an integer number (15841990080).

Almost surely, 2^211221011010 is an apocalyptic number.

211221011010 is an abundant number, since it is smaller than the sum of its proper divisors (295722671550).

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

211221011010 is a wasteful number, since it uses less digits than its factorization.

211221011010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184122.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 211221011010 its reverse (10110122112), we get a palindrome (221331133122).

The spelling of 211221011010 in words is "two hundred eleven billion, two hundred twenty-one million, eleven thousand, ten".