21837036 has 24 divisors (see below), whose sum is σ = 54872944. Its totient is φ = 6719040.

The previous prime is 21837031. The next prime is 21837037. The reversal of 21837036 is 63073812.

It is a super-2 number, since 2×21837036² = 953712282530592, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21836994 and 21837012.

It is not an unprimeable number, because it can be changed into a prime (21837031) 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 7 ways as a sum of consecutive naturals, for example, 69835 + ... + 70146.

Almost surely, 2^21837036 is an apocalyptic number.

21837036 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21837036 is an abundant number, since it is smaller than the sum of its proper divisors (33035908).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21837036 is a wasteful number, since it uses less digits than its factorization.

21837036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140001 (or 139999 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 21837036 is about 4673.0114487341. The cubic root of 21837036 is about 279.5103517127.

The spelling of 21837036 in words is "twenty-one million, eight hundred thirty-seven thousand, thirty-six".