21954646 has 12 divisors (see below), whose sum is σ = 38308788. Its totient is φ = 9409092.

The previous prime is 21954643. The next prime is 21954679. The reversal of 21954646 is 64645912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21954643) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 111916 + ... + 112111.

It is an arithmetic number, because the mean of its divisors is an integer number (3192399).

Almost surely, 2^21954646 is an apocalyptic number.

21954646 is a deficient number, since it is larger than the sum of its proper divisors (16354142).

21954646 is a wasteful number, since it uses less digits than its factorization.

21954646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224043 (or 224036 counting only the distinct ones).

The product of its digits is 51840, while the sum is 37.

The square root of 21954646 is about 4685.5785128413. The cubic root of 21954646 is about 280.0112495480.

The spelling of 21954646 in words is "twenty-one million, nine hundred fifty-four thousand, six hundred forty-six".