1221211202110 has 16 divisors (see below), whose sum is σ = 2198569117536. Its totient is φ = 488398046688.

The previous prime is 1221211202093. The next prime is 1221211202111. The reversal of 1221211202110 is 112021121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221211202111) 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, 10744914 + ... + 10857973.

It is an arithmetic number, because the mean of its divisors is an integer number (137410569846).

Almost surely, 2^{1221211202110} is an apocalyptic number.

1221211202110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221211202110 is a deficient number, since it is larger than the sum of its proper divisors (977357915426).

1221211202110 is a wasteful number, since it uses less digits than its factorization.

1221211202110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21608547.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1221211202110 its reverse (112021121221), we get a palindrome (1333232323331).

It can be divided in two parts, 122121 and 1202110, that added together give a palindrome (1324231).

The spelling of 1221211202110 in words is "one trillion, two hundred twenty-one billion, two hundred eleven million, two hundred two thousand, one hundred ten".