21266376 has 32 divisors (see below), whose sum is σ = 53408160. Its totient is φ = 7056512.

The previous prime is 21266327. The next prime is 21266389. The reversal of 21266376 is 67366212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3691 + ... + 7493.

It is an arithmetic number, because the mean of its divisors is an integer number (1669005).

Almost surely, 2^21266376 is an apocalyptic number.

It is an amenable number.

21266376 is an abundant number, since it is smaller than the sum of its proper divisors (32141784).

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

21266376 is a wasteful number, since it uses less digits than its factorization.

21266376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4045 (or 4041 counting only the distinct ones).

The product of its digits is 18144, while the sum is 33.

The square root of 21266376 is about 4611.5481131611. The cubic root of 21266376 is about 277.0540455046.

The spelling of 21266376 in words is "twenty-one million, two hundred sixty-six thousand, three hundred seventy-six".