21210002 has 32 divisors (see below), whose sum is σ = 36578304. Its totient is φ = 9130000.

The previous prime is 21209963. The next prime is 21210011. The reversal of 21210002 is 20001212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84377 + ... + 84627.

It is an arithmetic number, because the mean of its divisors is an integer number (1143072).

Almost surely, 2^21210002 is an apocalyptic number.

21210002 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21210002 is a deficient number, since it is larger than the sum of its proper divisors (15368302).

21210002 is a wasteful number, since it uses less digits than its factorization.

21210002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 454.

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

The square root of 21210002 is about 4605.4317930027. The cubic root of 21210002 is about 276.8090191772.

Adding to 21210002 its reverse (20001212), we get a palindrome (41211214).

The spelling of 21210002 in words is "twenty-one million, two hundred ten thousand, two".