21002002 has 8 divisors (see below), whose sum is σ = 36003456. Its totient is φ = 9000852.

The previous prime is 21001991. The next prime is 21002039. The reversal of 21002002 is 20020012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (7).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 750058 + ... + 750085.

It is an arithmetic number, because the mean of its divisors is an integer number (4500432).

Almost surely, 2^21002002 is an apocalyptic number.

21002002 is a deficient number, since it is larger than the sum of its proper divisors (15001454).

21002002 is a wasteful number, since it uses less digits than its factorization.

21002002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1500152.

The product of its (nonzero) digits is 8, while the sum is 7.

The square root of 21002002 is about 4582.7941258582. The cubic root of 21002002 is about 275.9011846075.

Adding to 21002002 its reverse (20020012), we get a palindrome (41022014).

The spelling of 21002002 in words is "twenty-one million, two thousand, two".