1211211112210 has 16 divisors (see below), whose sum is σ = 2378378184192. Its totient is φ = 440440404400.

The previous prime is 1211211112201. The next prime is 1211211112219. The reversal of 1211211112210 is 122111121121.

It is an interprime number because it is at equal distance from previous prime (1211211112201) and next prime (1211211112219).

It is a super-2 number, since 2×1211211112210² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1211211112219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5505504946 + ... + 5505505165.

It is an arithmetic number, because the mean of its divisors is an integer number (148648636512).

Almost surely, 2^{1211211112210} is an apocalyptic number.

1211211112210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211211112210 is a deficient number, since it is larger than the sum of its proper divisors (1167167071982).

1211211112210 is a wasteful number, since it uses less digits than its factorization.

1211211112210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11011010129.

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

Adding to 1211211112210 its reverse (122111121121), we get a palindrome (1333322233331).

The spelling of 1211211112210 in words is "one trillion, two hundred eleven billion, two hundred eleven million, one hundred twelve thousand, two hundred ten".