21986037 has 12 divisors (see below), whose sum is σ = 32782464. Its totient is φ = 14184360.

The previous prime is 21986023. The next prime is 21986057. The reversal of 21986037 is 73068912.

It is not a de Polignac number, because 21986037 - 2¹² = 21981941 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21985992 and 21986010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21986017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39123 + ... + 39680.

It is an arithmetic number, because the mean of its divisors is an integer number (2731872).

Almost surely, 2^21986037 is an apocalyptic number.

It is an amenable number.

21986037 is a deficient number, since it is larger than the sum of its proper divisors (10796427).

21986037 is a wasteful number, since it uses less digits than its factorization.

21986037 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78840 (or 78837 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 21986037 is about 4688.9270627725. The cubic root of 21986037 is about 280.1446404059.

The spelling of 21986037 in words is "twenty-one million, nine hundred eighty-six thousand, thirty-seven".