2210001021 has 12 divisors (see below), whose sum is σ = 3195977148. Its totient is φ = 1471601664.

The previous prime is 2210001019. The next prime is 2210001029. The reversal of 2210001021 is 1201000122.

It can be written as a sum of positive squares in 2 ways, for example, as 467856900 + 1742144121 = 21630^2 + 41739^2 .

It is not a de Polignac number, because 2210001021 - 2¹ = 2210001019 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 = 2210000994 and 2210001012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2210001029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 136260 + ... + 151613.

It is an arithmetic number, because the mean of its divisors is an integer number (266331429).

Almost surely, 2^2210001021 is an apocalyptic number.

It is an amenable number.

2210001021 is a deficient number, since it is larger than the sum of its proper divisors (985976127).

2210001021 is a wasteful number, since it uses less digits than its factorization.

2210001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288732 (or 288729 counting only the distinct ones).

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

The square root of 2210001021 is about 47010.6479534158. The cubic root of 2210001021 is about 1302.5592623127.

Adding to 2210001021 its reverse (1201000122), we get a palindrome (3411001143).

The spelling of 2210001021 in words is "two billion, two hundred ten million, one thousand, twenty-one".