201102021 has 10 divisors (see below), whose sum is σ = 300411782. Its totient is φ = 134067960.

The previous prime is 201102019. The next prime is 201102043. The reversal of 201102021 is 120201102.

It can be written as a sum of positive squares in only one way, i.e., 200930625 + 171396 = 14175^2 + 414^2 .

It is not a de Polignac number, because 201102021 - 2¹ = 201102019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

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 = 201101994 and 201102012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201102001) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1241290 + ... + 1241451.

Almost surely, 2^201102021 is an apocalyptic number.

It is an amenable number.

201102021 is a deficient number, since it is larger than the sum of its proper divisors (99309761).

201102021 is an equidigital number, since it uses as much as digits as its factorization.

201102021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2482753 (or 2482744 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 201102021 is about 14181.0444255704. The cubic root of 201102021 is about 585.8756904913.

Adding to 201102021 its reverse (120201102), we get a palindrome (321303123).

The spelling of 201102021 in words is "two hundred one million, one hundred two thousand, twenty-one".