21369741 has 16 divisors (see below), whose sum is σ = 29198400. Its totient is φ = 13897728.

The previous prime is 21369739. The next prime is 21369749. The reversal of 21369741 is 14796312.

It is not a de Polignac number, because 21369741 - 2¹ = 21369739 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21369749) 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 15 ways as a sum of consecutive naturals, for example, 27405 + ... + 28173.

It is an arithmetic number, because the mean of its divisors is an integer number (1824900).

Almost surely, 2^21369741 is an apocalyptic number.

It is an amenable number.

21369741 is a deficient number, since it is larger than the sum of its proper divisors (7828659).

21369741 is a wasteful number, since it uses less digits than its factorization.

21369741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 988.

The product of its digits is 9072, while the sum is 33.

The square root of 21369741 is about 4622.7417189369. The cubic root of 21369741 is about 277.5021929865.

The spelling of 21369741 in words is "twenty-one million, three hundred sixty-nine thousand, seven hundred forty-one".