21246771 has 32 divisors (see below), whose sum is σ = 35123200. Its totient is φ = 11124864.

The previous prime is 21246761. The next prime is 21246781. The reversal of 21246771 is 17764212.

It is an interprime number because it is at equal distance from previous prime (21246761) and next prime (21246781).

It is not a de Polignac number, because 21246771 - 2⁶ = 21246707 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21246721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 60705 + ... + 61053.

It is an arithmetic number, because the mean of its divisors is an integer number (1097600).

Almost surely, 2^21246771 is an apocalyptic number.

21246771 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21246771 is a deficient number, since it is larger than the sum of its proper divisors (13876429).

21246771 is a wasteful number, since it uses less digits than its factorization.

21246771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 595.

The product of its digits is 4704, while the sum is 30.

The square root of 21246771 is about 4609.4219811165. The cubic root of 21246771 is about 276.9688826710.

The spelling of 21246771 in words is "twenty-one million, two hundred forty-six thousand, seven hundred seventy-one".