1100121101221 has 16 divisors (see below), whose sum is σ = 1180527239808. Its totient is φ = 1022629273600.

The previous prime is 1100121101213. The next prime is 1100121101237. The reversal of 1100121101221 is 1221011210011.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1100121101221 - 2³ = 1100121101213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1100121101021) 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, 2027335 + ... + 2512036.

It is an arithmetic number, because the mean of its divisors is an integer number (73782952488).

Almost surely, 2^{1100121101221} is an apocalyptic number.

It is an amenable number.

1100121101221 is a deficient number, since it is larger than the sum of its proper divisors (80406138587).

1100121101221 is a wasteful number, since it uses less digits than its factorization.

1100121101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4539692.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1100121101221 its reverse (1221011210011), we get a palindrome (2321132311232).

The spelling of 1100121101221 in words is "one trillion, one hundred billion, one hundred twenty-one million, one hundred one thousand, two hundred twenty-one".