21837741 has 16 divisors (see below), whose sum is σ = 32171904. Its totient is φ = 13105664.

The previous prime is 21837713. The next prime is 21837763. The reversal of 21837741 is 14773812.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21837741 - 2⁵ = 21837709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21837791) 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, 8136 + ... + 10481.

It is an arithmetic number, because the mean of its divisors is an integer number (2010744).

Almost surely, 2^21837741 is an apocalyptic number.

It is an amenable number.

21837741 is a deficient number, since it is larger than the sum of its proper divisors (10334163).

21837741 is a wasteful number, since it uses less digits than its factorization.

21837741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18660.

The product of its digits is 9408, while the sum is 33.

The square root of 21837741 is about 4673.0868812809. The cubic root of 21837741 is about 279.5133596404.

It can be divided in two parts, 21837 and 741, that added together give a triangular number (22578 = T₂₁₂).

The spelling of 21837741 in words is "twenty-one million, eight hundred thirty-seven thousand, seven hundred forty-one".