1221121200110 has 256 divisors, whose sum is σ = 2836236902400. Its totient is φ = 368890454016.

The previous prime is 1221121200107. The next prime is 1221121200217. The reversal of 1221121200110 is 110021211221.

It is a super-2 number, since 2×1221121200110² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 176791277 + ... + 176798183.

It is an arithmetic number, because the mean of its divisors is an integer number (11079050400).

Almost surely, 2^{1221121200110} is an apocalyptic number.

1221121200110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221121200110 is an abundant number, since it is smaller than the sum of its proper divisors (1615115702290).

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

1221121200110 is a wasteful number, since it uses less digits than its factorization.

1221121200110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7123.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1221121200110 its reverse (110021211221), we get a palindrome (1331142411331).

The spelling of 1221121200110 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-one million, two hundred thousand, one hundred ten".