21356334 has 24 divisors (see below), whose sum is σ = 47765952. Its totient is φ = 6888960.

The previous prime is 21356327. The next prime is 21356339. The reversal of 21356334 is 43365312.

It is a happy number.

21356334 is a `hidden beast` number, since 21 + 3 + 5 + 633 + 4 = 666.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21356298 and 21356307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21356339) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18579 + ... + 19694.

It is an arithmetic number, because the mean of its divisors is an integer number (1990248).

Almost surely, 2^21356334 is an apocalyptic number.

21356334 is an abundant number, since it is smaller than the sum of its proper divisors (26409618).

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

21356334 is a wasteful number, since it uses less digits than its factorization.

21356334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38312 (or 38309 counting only the distinct ones).

The product of its digits is 6480, while the sum is 27.

The square root of 21356334 is about 4621.2913779592. The cubic root of 21356334 is about 277.4441475127. Note that the first 3 decimals are identical.

The spelling of 21356334 in words is "twenty-one million, three hundred fifty-six thousand, three hundred thirty-four".