121101021221221 has 12 divisors (see below), whose sum is σ = 126622784626240. Its totient is φ = 115810526054520.

The previous prime is 121101021221207. The next prime is 121101021221269. The reversal of 121101021221221 is 122122120101121.

It is a happy number.

It is not a de Polignac number, because 121101021221221 - 2⁹ = 121101021220709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121101021281221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22503231 + ... + 27360508.

Almost surely, 2^{121101021221221} is an apocalyptic number.

It is an amenable number.

121101021221221 is a deficient number, since it is larger than the sum of its proper divisors (5521763405019).

121101021221221 is an equidigital number, since it uses as much as digits as its factorization.

121101021221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49868376 (or 49868353 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 121101021221221 its reverse (122122120101121), we get a palindrome (243223141322342).

The spelling of 121101021221221 in words is "one hundred twenty-one trillion, one hundred one billion, twenty-one million, two hundred twenty-one thousand, two hundred twenty-one".