1211222212210 has 16 divisors (see below), whose sum is σ = 2202676272216. Its totient is φ = 479494153728.

The previous prime is 1211222212201. The next prime is 1211222212219. The reversal of 1211222212210 is 122122221121.

It is an interprime number because it is at equal distance from previous prime (1211222212201) and next prime (1211222212219).

It can be written as a sum of positive squares in 4 ways, for example, as 823144296529 + 388077915681 = 907273^2 + 622959^2 .

It is not an unprimeable number, because it can be changed into a prime (1211222212219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 624340377 + ... + 624342316.

Almost surely, 2^{1211222212210} is an apocalyptic number.

1211222212210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211222212210 is a deficient number, since it is larger than the sum of its proper divisors (991454060006).

1211222212210 is a wasteful number, since it uses less digits than its factorization.

1211222212210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1248682797.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 1211222212210 its reverse (122122221121), we get a palindrome (1333344433331).

It can be divided in two parts, 121122 and 2212210, that added together give a palindrome (2333332).

The spelling of 1211222212210 in words is "one trillion, two hundred eleven billion, two hundred twenty-two million, two hundred twelve thousand, two hundred ten".