21214466 has 32 divisors (see below), whose sum is σ = 40134528. Its totient is φ = 8184960.

The previous prime is 21214463. The next prime is 21214477. The reversal of 21214466 is 66441212.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is not an unprimeable number, because it can be changed into a prime (21214463) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6041 + ... + 8883.

It is an arithmetic number, because the mean of its divisors is an integer number (1254204).

Almost surely, 2^21214466 is an apocalyptic number.

21214466 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21214466 is a deficient number, since it is larger than the sum of its proper divisors (18920062).

21214466 is a wasteful number, since it uses less digits than its factorization.

21214466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2906.

The product of its digits is 2304, while the sum is 26.

The square root of 21214466 is about 4605.9164126154. The cubic root of 21214466 is about 276.8284375124.

Adding to 21214466 its reverse (66441212), we get a palindrome (87655678).

The spelling of 21214466 in words is "twenty-one million, two hundred fourteen thousand, four hundred sixty-six".