21213002 has 8 divisors (see below), whose sum is σ = 31980000. Its totient is φ = 10553004.

The previous prime is 21212993. The next prime is 21213011. The reversal of 21213002 is 20031212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21212993) and next prime (21213011).

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26252 + ... + 27047.

It is an arithmetic number, because the mean of its divisors is an integer number (3997500).

Almost surely, 2^21213002 is an apocalyptic number.

21213002 is a deficient number, since it is larger than the sum of its proper divisors (10766998).

21213002 is a wasteful number, since it uses less digits than its factorization.

21213002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53500.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 21213002 is about 4605.7574838456. The cubic root of 21213002 is about 276.8220694338.

Adding to 21213002 its reverse (20031212), we get a palindrome (41244214).

The spelling of 21213002 in words is "twenty-one million, two hundred thirteen thousand, two".