21212414 has 4 divisors (see below), whose sum is σ = 31818624. Its totient is φ = 10606206.

The previous prime is 21212353. The next prime is 21212423. The reversal of 21212414 is 41421212.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 21212392 and 21212401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5303102 + ... + 5303105.

It is an arithmetic number, because the mean of its divisors is an integer number (7954656).

Almost surely, 2^21212414 is an apocalyptic number.

21212414 is a deficient number, since it is larger than the sum of its proper divisors (10606210).

21212414 is a wasteful number, since it uses less digits than its factorization.

21212414 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10606209.

The product of its digits is 128, while the sum is 17.

The square root of 21212414 is about 4605.6936502551. The cubic root of 21212414 is about 276.8195116805.

Adding to 21212414 its reverse (41421212), we get a palindrome (62633626).

The spelling of 21212414 in words is "twenty-one million, two hundred twelve thousand, four hundred fourteen".