1221111110210 has 16 divisors (see below), whose sum is σ = 2251609755192. Its totient is φ = 476531164800.

The previous prime is 1221111110209. The next prime is 1221111110231. The reversal of 1221111110210 is 120111111221.

It can be written as a sum of positive squares in 4 ways, for example, as 644910181969 + 576200928241 = 803063^2 + 759079^2 .

It is a super-2 number, since 2×1221111110210² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1489159481 + ... + 1489160300.

Almost surely, 2^{1221111110210} is an apocalyptic number.

1221111110210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221111110210 is a deficient number, since it is larger than the sum of its proper divisors (1030498644982).

1221111110210 is a wasteful number, since it uses less digits than its factorization.

1221111110210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2978319829.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 1221111110210 its reverse (120111111221), we get a palindrome (1341222221431).

It can be divided in two parts, 122111 and 1110210, that added together give a palindrome (1232321).

The spelling of 1221111110210 in words is "one trillion, two hundred twenty-one billion, one hundred eleven million, one hundred ten thousand, two hundred ten".