11211221212210 has 32 divisors (see below), whose sum is σ = 20955581729712. Its totient is φ = 4315177681920.

The previous prime is 11211221212207. The next prime is 11211221212237. The reversal of 11211221212210 is 1221212211211.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 106391435329 + 11104829776881 = 326177^2 + 3332391^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 187260769 + ... + 187320628.

Almost surely, 2^{11211221212210} is an apocalyptic number.

11211221212210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11211221212210 is a deficient number, since it is larger than the sum of its proper divisors (9744360517502).

11211221212210 is a wasteful number, since it uses less digits than its factorization.

11211221212210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374581518.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 11211221212210 its reverse (1221212211211), we get a palindrome (12432433423421).

Subtracting from 11211221212210 its reverse (1221212211211), we obtain a palindrome (9990009000999).

It can be divided in two parts, 1121122 and 1212210, that added together give a palindrome (2333332).

The spelling of 11211221212210 in words is "eleven trillion, two hundred eleven billion, two hundred twenty-one million, two hundred twelve thousand, two hundred ten".