21914012 has 6 divisors (see below), whose sum is σ = 38349528. Its totient is φ = 10957004.

The previous prime is 21913979. The next prime is 21914017. The reversal of 21914012 is 21041912.

It is a super-2 number, since 2×21914012² = 960447843872288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21914017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2739248 + ... + 2739255.

It is an arithmetic number, because the mean of its divisors is an integer number (6391588).

Almost surely, 2^21914012 is an apocalyptic number.

It is an amenable number.

21914012 is a deficient number, since it is larger than the sum of its proper divisors (16435516).

21914012 is a wasteful number, since it uses less digits than its factorization.

21914012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5478507 (or 5478505 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 21914012 is about 4681.2404339021. The cubic root of 21914012 is about 279.8383931383.

Adding to 21914012 its reverse (21041912), we get a palindrome (42955924).

The spelling of 21914012 in words is "twenty-one million, nine hundred fourteen thousand, twelve".