1211222211210 has 96 divisors (see below), whose sum is σ = 3584834817408. Its totient is φ = 280863116160.

The previous prime is 1211222211193. The next prime is 1211222211211. The reversal of 1211222211210 is 121122221121.

1211222211210 is a `hidden beast` number, since 1 + 21 + 1 + 222 + 211 + 210 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1211222211211) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 26574117 + ... + 26619656.

It is an arithmetic number, because the mean of its divisors is an integer number (37342029348).

Almost surely, 2^{1211222211210} is an apocalyptic number.

1211222211210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211222211210 is an abundant number, since it is smaller than the sum of its proper divisors (2373612606198).

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

1211222211210 is a wasteful number, since it uses less digits than its factorization.

1211222211210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53193820 (or 53193817 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1211222211210 its reverse (121122221121), we get a palindrome (1332344432331).

It can be divided in two parts, 121122 and 2211210, that added together give a palindrome (2332332).

The spelling of 1211222211210 in words is "one trillion, two hundred eleven billion, two hundred twenty-two million, two hundred eleven thousand, two hundred ten".