1101021221021 has 4 divisors (see below), whose sum is σ = 1101354766044. Its totient is φ = 1100687676000.

The previous prime is 1101021220973. The next prime is 1101021221057. The reversal of 1101021221021 is 1201221201011.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 746001873796 + 355019347225 = 863714^2 + 595835^2 .

It is a cyclic number.

It is not a de Polignac number, because 1101021221021 - 2³⁴ = 1083841351837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1101021220987 and 1101021221005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1101021221221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166767560 + ... + 166774161.

It is an arithmetic number, because the mean of its divisors is an integer number (275338691511).

Almost surely, 2^{1101021221021} is an apocalyptic number.

It is an amenable number.

1101021221021 is a deficient number, since it is larger than the sum of its proper divisors (333545023).

1101021221021 is an equidigital number, since it uses as much as digits as its factorization.

1101021221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333545022.

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

Adding to 1101021221021 its reverse (1201221201011), we get a palindrome (2302242422032).

The spelling of 1101021221021 in words is "one trillion, one hundred one billion, twenty-one million, two hundred twenty-one thousand, twenty-one".