1101020111221 has 8 divisors (see below), whose sum is σ = 1116165471320. Its totient is φ = 1085876451072.

The previous prime is 1101020111209. The next prime is 1101020111297. The reversal of 1101020111221 is 1221110201011.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 532973002500 + 568047108721 = 730050^2 + 753689^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1101020111221 - 2¹⁷ = 1101019980149 is a prime.

It is a super-2 number, since 2×1101020111221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1101020118221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 907825 + ... + 1739593.

It is an arithmetic number, because the mean of its divisors is an integer number (139520683915).

Almost surely, 2^{1101020111221} is an apocalyptic number.

It is an amenable number.

1101020111221 is a deficient number, since it is larger than the sum of its proper divisors (15145360099).

1101020111221 is an equidigital number, since it uses as much as digits as its factorization.

1101020111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 849975.

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

Adding to 1101020111221 its reverse (1221110201011), we get a palindrome (2322130312232).

The spelling of 1101020111221 in words is "one trillion, one hundred one billion, twenty million, one hundred eleven thousand, two hundred twenty-one".