21269941 has 16 divisors (see below), whose sum is σ = 28080000. Its totient is φ = 15598080.

The previous prime is 21269923. The next prime is 21269947. The reversal of 21269941 is 14996212.

It is a cyclic number.

It is not a de Polignac number, because 21269941 - 2⁵ = 21269909 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21269897 and 21269906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21269947) 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, 6816 + ... + 9433.

It is an arithmetic number, because the mean of its divisors is an integer number (1755000).

Almost surely, 2^21269941 is an apocalyptic number.

It is an amenable number.

21269941 is a deficient number, since it is larger than the sum of its proper divisors (6810059).

21269941 is a wasteful number, since it uses less digits than its factorization.

21269941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16284.

The product of its digits is 7776, while the sum is 34.

The square root of 21269941 is about 4611.9346265965. The cubic root of 21269941 is about 277.0695260059.

It can be divided in two parts, 21 and 269941, that added together give a palindrome (269962).

The spelling of 21269941 in words is "twenty-one million, two hundred sixty-nine thousand, nine hundred forty-one".