21136466 has 16 divisors (see below), whose sum is σ = 34219584. Its totient is φ = 9733584.

The previous prime is 21136463. The next prime is 21136469. The reversal of 21136466 is 66463112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21136463) and next prime (21136469).

It is not an unprimeable number, because it can be changed into a prime (21136463) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21011 + ... + 21993.

It is an arithmetic number, because the mean of its divisors is an integer number (2138724).

Almost surely, 2^21136466 is an apocalyptic number.

21136466 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21136466 is a deficient number, since it is larger than the sum of its proper divisors (13083118).

21136466 is a wasteful number, since it uses less digits than its factorization.

21136466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1825.

The product of its digits is 5184, while the sum is 29.

The square root of 21136466 is about 4597.4412448665. The cubic root of 21136466 is about 276.4887457855.

Adding to 21136466 its reverse (66463112), we get a palindrome (87599578).

The spelling of 21136466 in words is "twenty-one million, one hundred thirty-six thousand, four hundred sixty-six".