1221220220110 has 32 divisors (see below), whose sum is σ = 2398089867264. Its totient is φ = 444069444000.

The previous prime is 1221220220083. The next prime is 1221220220131. The reversal of 1221220220110 is 110220221221.

It is a happy number.

It is a congruent number.

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, 5598795 + ... + 5812825.

It is an arithmetic number, because the mean of its divisors is an integer number (74940308352).

Almost surely, 2^{1221220220110} is an apocalyptic number.

1221220220110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221220220110 is a deficient number, since it is larger than the sum of its proper divisors (1176869647154).

1221220220110 is a wasteful number, since it uses less digits than its factorization.

1221220220110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265920.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1221220220110 its reverse (110220221221), we get a palindrome (1331440441331).

The spelling of 1221220220110 in words is "one trillion, two hundred twenty-one billion, two hundred twenty million, two hundred twenty thousand, one hundred ten".