1221202210110 has 32 divisors (see below), whose sum is σ = 2931019378560. Its totient is φ = 325639025568.

The previous prime is 1221202210097. The next prime is 1221202210117. The reversal of 1221202210110 is 110122021221.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1221202210110.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221202210117) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 256320 + ... + 1583699.

It is an arithmetic number, because the mean of its divisors is an integer number (91594355580).

Almost surely, 2^{1221202210110} is an apocalyptic number.

1221202210110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221202210110 is an abundant number, since it is smaller than the sum of its proper divisors (1709817168450).

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

1221202210110 is a wasteful number, since it uses less digits than its factorization.

1221202210110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1862152.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1221202210110 its reverse (110122021221), we get a palindrome (1331324231331).

The spelling of 1221202210110 in words is "one trillion, two hundred twenty-one billion, two hundred two million, two hundred ten thousand, one hundred ten".