21213102 has 8 divisors (see below), whose sum is σ = 42426216. Its totient is φ = 7071032.

The previous prime is 21213097. The next prime is 21213109. The reversal of 21213102 is 20131212.

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

21213102 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1767753 + ... + 1767764.

It is an arithmetic number, because the mean of its divisors is an integer number (5303277).

Almost surely, 2^21213102 is an apocalyptic number.

21213102 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21213102 is a wasteful number, since it uses less digits than its factorization.

21213102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3535522.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 21213102 is about 4605.7683398104. The cubic root of 21213102 is about 276.8225044212.

Adding to 21213102 its reverse (20131212), we get a palindrome (41344314).

The spelling of 21213102 in words is "twenty-one million, two hundred thirteen thousand, one hundred two".