21037734 has 12 divisors (see below), whose sum is σ = 45581796. Its totient is φ = 7012572.

The previous prime is 21037729. The next prime is 21037739. The reversal of 21037734 is 43773012.

It is an interprime number because it is at equal distance from previous prime (21037729) and next prime (21037739).

It is a junction number, because it is equal to n+sod(n) for n = 21037698 and 21037707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21037739) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 584364 + ... + 584399.

It is an arithmetic number, because the mean of its divisors is an integer number (3798483).

Almost surely, 2^21037734 is an apocalyptic number.

21037734 is an abundant number, since it is smaller than the sum of its proper divisors (24544062).

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

21037734 is a wasteful number, since it uses less digits than its factorization.

21037734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1168771 (or 1168768 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 27.

The square root of 21037734 is about 4586.6909640829. The cubic root of 21037734 is about 276.0575651825.

The spelling of 21037734 in words is "twenty-one million, thirty-seven thousand, seven hundred thirty-four".