21884037 has 24 divisors (see below), whose sum is σ = 34780032. Its totient is φ = 12196800.

The previous prime is 21884011. The next prime is 21884041. The reversal of 21884037 is 73048812.

It is not a de Polignac number, because 21884037 - 2¹⁰ = 21883013 is a prime.

It is a super-2 number, since 2×21884037² = 957822150834738, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21883989 and 21884007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21884437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4212 + ... + 7842.

It is an arithmetic number, because the mean of its divisors is an integer number (1449168).

Almost surely, 2^21884037 is an apocalyptic number.

It is an amenable number.

21884037 is a deficient number, since it is larger than the sum of its proper divisors (12895995).

21884037 is a wasteful number, since it uses less digits than its factorization.

21884037 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3689 (or 3682 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 21884037 is about 4678.0377296469. The cubic root of 21884037 is about 279.7107429494.

It can be divided in two parts, 218 and 84037, that added together give a triangular number (84255 = T₄₁₀).

The spelling of 21884037 in words is "twenty-one million, eight hundred eighty-four thousand, thirty-seven".