21298662 has 96 divisors (see below), whose sum is σ = 58466304. Its totient is φ = 5488560.

The previous prime is 21298583. The next prime is 21298681. The reversal of 21298662 is 26689212.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 167643 + ... + 167769.

It is an arithmetic number, because the mean of its divisors is an integer number (609024).

Almost surely, 2^21298662 is an apocalyptic number.

21298662 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21298662, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29233152).

21298662 is an abundant number, since it is smaller than the sum of its proper divisors (37167642).

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

21298662 is a wasteful number, since it uses less digits than its factorization.

21298662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175 (or 150 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 21298662 is about 4615.0473453693. The cubic root of 21298662 is about 277.1941797720.

The spelling of 21298662 in words is "twenty-one million, two hundred ninety-eight thousand, six hundred sixty-two".