1101211021221 has 16 divisors (see below), whose sum is σ = 1519838398464. Its totient is φ = 708674629824.

The previous prime is 1101211021213. The next prime is 1101211021223. The reversal of 1101211021221 is 1221201121011.

It is a happy number.

It is not a de Polignac number, because 1101211021221 - 2³ = 1101211021213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1101211021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1101211021223) 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, 39044250 + ... + 39072443.

It is an arithmetic number, because the mean of its divisors is an integer number (94989899904).

Almost surely, 2^{1101211021221} is an apocalyptic number.

It is an amenable number.

1101211021221 is a deficient number, since it is larger than the sum of its proper divisors (418627377243).

1101211021221 is a wasteful number, since it uses less digits than its factorization.

1101211021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78116860.

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

Adding to 1101211021221 its reverse (1221201121011), we get a palindrome (2322412142232).

The spelling of 1101211021221 in words is "one trillion, one hundred one billion, two hundred eleven million, twenty-one thousand, two hundred twenty-one".