21037698 has 64 divisors (see below), whose sum is σ = 51632640. Its totient is φ = 6296400.

The previous prime is 21037657. The next prime is 21037699. The reversal of 21037698 is 89673012.

It is not an unprimeable number, because it can be changed into a prime (21037699) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 63393 + ... + 63723.

It is an arithmetic number, because the mean of its divisors is an integer number (806760).

Almost surely, 2^21037698 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21037698, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25816320).

21037698 is an abundant number, since it is smaller than the sum of its proper divisors (30594942).

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

21037698 is a wasteful number, since it uses less digits than its factorization.

21037698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460 (or 454 counting only the distinct ones).

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

The square root of 21037698 is about 4586.6870396834. The cubic root of 21037698 is about 276.0574077182.

It can be divided in two parts, 2103 and 7698, that added together give a square (9801 = 99²).

The spelling of 21037698 in words is "twenty-one million, thirty-seven thousand, six hundred ninety-eight".