1221131020110 has 64 divisors (see below), whose sum is σ = 3085095928320. Its totient is φ = 308482922880.

The previous prime is 1221131020069. The next prime is 1221131020157. The reversal of 1221131020110 is 110201311221.

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 1221131020110.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25660999 + ... + 25708541.

It is an arithmetic number, because the mean of its divisors is an integer number (48204623880).

Almost surely, 2^{1221131020110} is an apocalyptic number.

1221131020110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221131020110 is an abundant number, since it is smaller than the sum of its proper divisors (1863964908210).

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

1221131020110 is a wasteful number, since it uses less digits than its factorization.

1221131020110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92633.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 1221131020110 its reverse (110201311221), we get a palindrome (1331332331331).

The spelling of 1221131020110 in words is "one trillion, two hundred twenty-one billion, one hundred thirty-one million, twenty thousand, one hundred ten".