1101121021221 has 32 divisors (see below), whose sum is σ = 1671776010240. Its totient is φ = 639070305984.

The previous prime is 1101121021219. The next prime is 1101121021289. The reversal of 1101121021221 is 1221201211011.

It is a happy number.

It is not a de Polignac number, because 1101121021221 - 2¹ = 1101121021219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1101121021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1101121021211) 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, 3166581 + ... + 3497066.

It is an arithmetic number, because the mean of its divisors is an integer number (52243000320).

Almost surely, 2^{1101121021221} is an apocalyptic number.

It is an amenable number.

1101121021221 is a deficient number, since it is larger than the sum of its proper divisors (570654989019).

1101121021221 is a wasteful number, since it uses less digits than its factorization.

1101121021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6663905.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1101121021221 its reverse (1221201211011), we get a palindrome (2322322232232).

The spelling of 1101121021221 in words is "one trillion, one hundred one billion, one hundred twenty-one million, twenty-one thousand, two hundred twenty-one".