21736098 has 48 divisors (see below), whose sum is σ = 50240736. Its totient is φ = 6768000.

The previous prime is 21736093. The next prime is 21736103. The reversal of 21736098 is 89063712.

It is an interprime number because it is at equal distance from previous prime (21736093) and next prime (21736103).

It is not an unprimeable number, because it can be changed into a prime (21736093) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 76665 + ... + 76947.

It is an arithmetic number, because the mean of its divisors is an integer number (1046682).

Almost surely, 2^21736098 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21736098, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25120368).

21736098 is an abundant number, since it is smaller than the sum of its proper divisors (28504638).

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

21736098 is a wasteful number, since it uses less digits than its factorization.

21736098 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559 (or 556 counting only the distinct ones).

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

The square root of 21736098 is about 4662.1988374586. The cubic root of 21736098 is about 279.0790233626.

It can be divided in two parts, 217 and 36098, that added together give a triangular number (36315 = T₂₆₉).

The spelling of 21736098 in words is "twenty-one million, seven hundred thirty-six thousand, ninety-eight".