1101021210221 has 4 divisors (see below), whose sum is σ = 1101023353500. Its totient is φ = 1101019066944.

The previous prime is 1101021210217. The next prime is 1101021210281. The reversal of 1101021210221 is 1220121201011.

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 149294140996 + 951727069225 = 386386^2 + 975565^2 .

It is a cyclic number.

It is not a de Polignac number, because 1101021210221 - 2² = 1101021210217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1101021210196 and 1101021210205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1101021210281) 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, 209285 + ... + 1498613.

It is an arithmetic number, because the mean of its divisors is an integer number (275255838375).

Almost surely, 2^{1101021210221} is an apocalyptic number.

It is an amenable number.

1101021210221 is a deficient number, since it is larger than the sum of its proper divisors (2143279).

1101021210221 is an equidigital number, since it uses as much as digits as its factorization.

1101021210221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2143278.

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

Adding to 1101021210221 its reverse (1220121201011), we get a palindrome (2321142411232).

The spelling of 1101021210221 in words is "one trillion, one hundred one billion, twenty-one million, two hundred ten thousand, two hundred twenty-one".