2201001021 has 24 divisors (see below), whose sum is σ = 3377855520. Its totient is φ = 1377102816.

The previous prime is 2201001017. The next prime is 2201001041. The reversal of 2201001021 is 1201001022.

It is not a de Polignac number, because 2201001021 - 2² = 2201001017 is a prime.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2201000994 and 2201001012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2201001041) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41850 + ... + 78443.

It is an arithmetic number, because the mean of its divisors is an integer number (140743980).

Almost surely, 2^2201001021 is an apocalyptic number.

It is an amenable number.

2201001021 is a deficient number, since it is larger than the sum of its proper divisors (1176854499).

2201001021 is a wasteful number, since it uses less digits than its factorization.

2201001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120425 (or 120422 counting only the distinct ones).

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

The square root of 2201001021 is about 46914.8273043821. The cubic root of 2201001021 is about 1300.7886774482.

Adding to 2201001021 its reverse (1201001022), we get a palindrome (3402002043).

Subtracting from 2201001021 its reverse (1201001022), we obtain a palindrome (999999999).

The spelling of 2201001021 in words is "two billion, two hundred one million, one thousand, twenty-one".