21423068 has 12 divisors (see below), whose sum is σ = 37569000. Its totient is φ = 10689072.

The previous prime is 21423067. The next prime is 21423079. The reversal of 21423068 is 86032412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21423067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3371 + ... + 7362.

It is an arithmetic number, because the mean of its divisors is an integer number (3130750).

Almost surely, 2^21423068 is an apocalyptic number.

It is an amenable number.

21423068 is a deficient number, since it is larger than the sum of its proper divisors (16145932).

21423068 is a wasteful number, since it uses less digits than its factorization.

21423068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11236 (or 11234 counting only the distinct ones).

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

The square root of 21423068 is about 4628.5060224656. The cubic root of 21423068 is about 277.7328316730.

The spelling of 21423068 in words is "twenty-one million, four hundred twenty-three thousand, sixty-eight".