21652002 has 16 divisors (see below), whose sum is σ = 48115680. Its totient is φ = 7217316.

The previous prime is 21651989. The next prime is 21652003. The reversal of 21652002 is 20025612.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21652003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 200428 + ... + 200535.

It is an arithmetic number, because the mean of its divisors is an integer number (3007230).

Almost surely, 2^21652002 is an apocalyptic number.

21652002 is an abundant number, since it is smaller than the sum of its proper divisors (26463678).

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

21652002 is a wasteful number, since it uses less digits than its factorization.

21652002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400974 (or 400968 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 21652002 is about 4653.1711767353. The cubic root of 21652002 is about 278.7186434059.

Adding to 21652002 its reverse (20025612), we get a palindrome (41677614).

The spelling of 21652002 in words is "twenty-one million, six hundred fifty-two thousand, two".