21103002 has 48 divisors (see below), whose sum is σ = 48072960. Its totient is φ = 6681600.

The previous prime is 21102979. The next prime is 21103003. The reversal of 21103002 is 20030112.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (21103003) 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, 32602 + ... + 33242.

It is an arithmetic number, because the mean of its divisors is an integer number (1001520).

Almost surely, 2^21103002 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21103002, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24036480).

21103002 is an abundant number, since it is smaller than the sum of its proper divisors (26969958).

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

21103002 is a wasteful number, since it uses less digits than its factorization.

21103002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 739 (or 736 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 21103002 is about 4593.8003874788. The cubic root of 21103002 is about 276.3427531267.

Adding to 21103002 its reverse (20030112), we get a palindrome (41133114).

The spelling of 21103002 in words is "twenty-one million, one hundred three thousand, two".