21266342 has 8 divisors (see below), whose sum is σ = 32761776. Its totient is φ = 10345752.

The previous prime is 21266327. The next prime is 21266389. The reversal of 21266342 is 24366212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143618 + ... + 143765.

It is an arithmetic number, because the mean of its divisors is an integer number (4095222).

Almost surely, 2^21266342 is an apocalyptic number.

21266342 is a deficient number, since it is larger than the sum of its proper divisors (11495434).

21266342 is a wasteful number, since it uses less digits than its factorization.

21266342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287422.

The product of its digits is 3456, while the sum is 26.

The square root of 21266342 is about 4611.5444267620. The cubic root of 21266342 is about 277.0538978561.

The spelling of 21266342 in words is "twenty-one million, two hundred sixty-six thousand, three hundred forty-two".