21202002 has 24 divisors (see below), whose sum is σ = 47059740. Its totient is φ = 6894720.

The previous prime is 21202001. The next prime is 21202003. The reversal of 21202002 is 20020212.

It is an interprime number because it is at equal distance from previous prime (21202001) and next prime (21202003).

It can be written as a sum of positive squares in 2 ways, for example, as 18740241 + 2461761 = 4329^2 + 1569^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202001) 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, 13627 + ... + 15102.

Almost surely, 2^21202002 is an apocalyptic number.

21202002 is an abundant number, since it is smaller than the sum of its proper divisors (25857738).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21202002 is a wasteful number, since it uses less digits than its factorization.

21202002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28778 (or 28775 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 21202002 is about 4604.5631714637. The cubic root of 21202002 is about 276.7742124756.

Adding to 21202002 its reverse (20020212), we get a palindrome (41222214).

The spelling of 21202002 in words is "twenty-one million, two hundred two thousand, two".