21346775 has 12 divisors (see below), whose sum is σ = 26633712. Its totient is φ = 16971840.

The previous prime is 21346753. The next prime is 21346777. The reversal of 21346775 is 57764312.

It is not a de Polignac number, because 21346775 - 2⁶ = 21346711 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21346777) 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, 1619 + ... + 6731.

It is an arithmetic number, because the mean of its divisors is an integer number (2219476).

Almost surely, 2^21346775 is an apocalyptic number.

21346775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21346775 is a deficient number, since it is larger than the sum of its proper divisors (5286937).

21346775 is a wasteful number, since it uses less digits than its factorization.

21346775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5290 (or 5285 counting only the distinct ones).

The product of its digits is 35280, while the sum is 35.

The square root of 21346775 is about 4620.2570274823. The cubic root of 21346775 is about 277.4027470802.

The spelling of 21346775 in words is "twenty-one million, three hundred forty-six thousand, seven hundred seventy-five".