1221121000110 has 64 divisors (see below), whose sum is σ = 3257439805440. Its totient is φ = 290443870080.

The previous prime is 1221121000103. The next prime is 1221121000117. The reversal of 1221121000110 is 110001211221.

It is an interprime number because it is at equal distance from previous prime (1221121000103) and next prime (1221121000117).

It is a super-2 number, since 2×1221121000110² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221121000117) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34891630 + ... + 34926609.

It is an arithmetic number, because the mean of its divisors is an integer number (50897496960).

Almost surely, 2^{1221121000110} is an apocalyptic number.

1221121000110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221121000110 is an abundant number, since it is smaller than the sum of its proper divisors (2036318805330).

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

1221121000110 is a wasteful number, since it uses less digits than its factorization.

1221121000110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69818313.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1221121000110 its reverse (110001211221), we get a palindrome (1331122211331).

The spelling of 1221121000110 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-one million, one hundred ten", and thus it is an aban number.