21334951 has 4 divisors (see below), whose sum is σ = 23274504. Its totient is φ = 19395400.

The previous prime is 21334927. The next prime is 21334969. The reversal of 21334951 is 15943312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21334951 - 2⁵ = 21334919 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21334451) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 969760 + ... + 969781.

It is an arithmetic number, because the mean of its divisors is an integer number (5818626).

Almost surely, 2^21334951 is an apocalyptic number.

21334951 is a deficient number, since it is larger than the sum of its proper divisors (1939553).

21334951 is a wasteful number, since it uses less digits than its factorization.

21334951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1939552.

The product of its digits is 3240, while the sum is 28.

The square root of 21334951 is about 4618.9772677509. The cubic root of 21334951 is about 277.3515197345.

The spelling of 21334951 in words is "twenty-one million, three hundred thirty-four thousand, nine hundred fifty-one".