21942336 has 112 divisors (see below), whose sum is σ = 64008000. Its totient is φ = 6592512.

The previous prime is 21942317. The next prime is 21942377. The reversal of 21942336 is 63324912.

It is a super-2 number, since 2×21942336² = 962932218273792, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 147190 + ... + 147338.

It is an arithmetic number, because the mean of its divisors is an integer number (571500).

Almost surely, 2^21942336 is an apocalyptic number.

21942336 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21942336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32004000).

21942336 is an abundant number, since it is smaller than the sum of its proper divisors (42065664).

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

21942336 is a wasteful number, since it uses less digits than its factorization.

21942336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236 (or 226 counting only the distinct ones).

The product of its digits is 7776, while the sum is 30.

The square root of 21942336 is about 4684.2647235185. The cubic root of 21942336 is about 279.9589055337.

The spelling of 21942336 in words is "twenty-one million, nine hundred forty-two thousand, three hundred thirty-six".