21221414 has 8 divisors (see below), whose sum is σ = 31901688. Its totient is φ = 10587520.

The previous prime is 21221411. The next prime is 21221419. The reversal of 21221414 is 41412212.

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

It is a junction number, because it is equal to n+sod(n) for n = 21221392 and 21221401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221411) 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, 10427 + ... + 12294.

It is an arithmetic number, because the mean of its divisors is an integer number (3987711).

Almost surely, 2^21221414 is an apocalyptic number.

21221414 is a deficient number, since it is larger than the sum of its proper divisors (10680274).

21221414 is a wasteful number, since it uses less digits than its factorization.

21221414 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23190.

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

The square root of 21221414 is about 4606.6705981652. The cubic root of 21221414 is about 276.8586557927.

Adding to 21221414 its reverse (41412212), we get a palindrome (62633626).

The spelling of 21221414 in words is "twenty-one million, two hundred twenty-one thousand, four hundred fourteen".