1101021021221 has 4 divisors (see below), whose sum is σ = 1201113841344. Its totient is φ = 1000928201100.

The previous prime is 1101021021211. The next prime is 1101021021227. The reversal of 1101021021221 is 1221201201011.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1101021021221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1101021021196 and 1101021021205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1101021021227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50046410045 + ... + 50046410066.

It is an arithmetic number, because the mean of its divisors is an integer number (300278460336).

Almost surely, 2^{1101021021221} is an apocalyptic number.

1101021021221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1101021021221 is a deficient number, since it is larger than the sum of its proper divisors (100092820123).

1101021021221 is a wasteful number, since it uses less digits than its factorization.

1101021021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100092820122.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1101021021221 its reverse (1221201201011), we get a palindrome (2322222222232).

The spelling of 1101021021221 in words is "one trillion, one hundred one billion, twenty-one million, twenty-one thousand, two hundred twenty-one".