21267741 has 16 divisors (see below), whose sum is σ = 31019328. Its totient is φ = 12854400.

The previous prime is 21267737. The next prime is 21267761. The reversal of 21267741 is 14776212.

It is not a de Polignac number, because 21267741 - 2² = 21267737 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21267699 and 21267708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21267721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16575 + ... + 17811.

It is an arithmetic number, because the mean of its divisors is an integer number (1938708).

Almost surely, 2^21267741 is an apocalyptic number.

It is an amenable number.

21267741 is a deficient number, since it is larger than the sum of its proper divisors (9751587).

21267741 is a wasteful number, since it uses less digits than its factorization.

21267741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1772.

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

The square root of 21267741 is about 4611.6961088086. The cubic root of 21267741 is about 277.0599730257.

It can be divided in two parts, 21 and 267741, that added together give a palindrome (267762).

The spelling of 21267741 in words is "twenty-one million, two hundred sixty-seven thousand, seven hundred forty-one".