1101020031221 has 6 divisors (see below), whose sum is σ = 1210212100566. Its totient is φ = 1000927301000.

The previous prime is 1101020031191. The next prime is 1101020031229. The reversal of 1101020031221 is 1221300201011.

It can be written as a sum of positive squares in only one way, i.e., 1045741438225 + 55278592996 = 1022615^2 + 235114^2 .

It is not a de Polignac number, because 1101020031221 - 2¹⁸ = 1101019769077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1101020031196 and 1101020031205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1101020031229) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4549669430 + ... + 4549669671.

It is an arithmetic number, because the mean of its divisors is an integer number (201702016761).

Almost surely, 2^{1101020031221} is an apocalyptic number.

1101020031221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1101020031221 is a deficient number, since it is larger than the sum of its proper divisors (109192069345).

1101020031221 is an equidigital number, since it uses as much as digits as its factorization.

1101020031221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9099339123 (or 9099339112 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 1101020031221 its reverse (1221300201011), we get a palindrome (2322320232232).

The spelling of 1101020031221 in words is "one trillion, one hundred one billion, twenty million, thirty-one thousand, two hundred twenty-one".