21926072 has 16 divisors (see below), whose sum is σ = 46984560. Its totient is φ = 9396864.

The previous prime is 21926071. The next prime is 21926077. The reversal of 21926072 is 27062912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21926071) 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 3 ways as a sum of consecutive naturals, for example, 195713 + ... + 195824.

It is an arithmetic number, because the mean of its divisors is an integer number (2936535).

Almost surely, 2^21926072 is an apocalyptic number.

It is an amenable number.

21926072 is an abundant number, since it is smaller than the sum of its proper divisors (25058488).

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

21926072 is a wasteful number, since it uses less digits than its factorization.

21926072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391550 (or 391546 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 21926072 is about 4682.5283768494. The cubic root of 21926072 is about 279.8897184747.

Adding to 21926072 its reverse (27062912), we get a palindrome (48988984).

The spelling of 21926072 in words is "twenty-one million, nine hundred twenty-six thousand, seventy-two".