21946692 has 48 divisors (see below), whose sum is σ = 53932032. Its totient is φ = 6932640.

The previous prime is 21946681. The next prime is 21946693. The reversal of 21946692 is 29664912.

It is a super-5 number, since 5×21946692⁵ (a number of 38 digits) contains 55555 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21946692.

It is not an unprimeable number, because it can be changed into a prime (21946693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35853 + ... + 36459.

It is an arithmetic number, because the mean of its divisors is an integer number (1123584).

Almost surely, 2^21946692 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21946692, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26966016).

21946692 is an abundant number, since it is smaller than the sum of its proper divisors (31985340).

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

21946692 is a wasteful number, since it uses less digits than its factorization.

21946692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 768 (or 766 counting only the distinct ones).

The product of its digits is 46656, while the sum is 39.

The square root of 21946692 is about 4684.7296613572. The cubic root of 21946692 is about 279.9774301536.

The spelling of 21946692 in words is "twenty-one million, nine hundred forty-six thousand, six hundred ninety-two".