21641412 has 24 divisors (see below), whose sum is σ = 54381376. Its totient is φ = 6658848.

The previous prime is 21641393. The next prime is 21641467. The reversal of 21641412 is 21414612.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69208 + ... + 69519.

Almost surely, 2^21641412 is an apocalyptic number.

It is an amenable number.

21641412 is an abundant number, since it is smaller than the sum of its proper divisors (32739964).

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

21641412 is a wasteful number, since it uses less digits than its factorization.

21641412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138747 (or 138745 counting only the distinct ones).

The product of its digits is 384, while the sum is 21.

The square root of 21641412 is about 4652.0331039235. The cubic root of 21641412 is about 278.6731955411.

The spelling of 21641412 in words is "twenty-one million, six hundred forty-one thousand, four hundred twelve".