21227896 has 32 divisors (see below), whose sum is σ = 42514560. Its totient is φ = 9912672.

The previous prime is 21227891. The next prime is 21227897. The reversal of 21227896 is 69872212.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21227891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6571 + ... + 9253.

It is an arithmetic number, because the mean of its divisors is an integer number (1328580).

Almost surely, 2^21227896 is an apocalyptic number.

It is an amenable number.

21227896 is an abundant number, since it is smaller than the sum of its proper divisors (21286664).

21227896 is a wasteful number, since it uses less digits than its factorization.

21227896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2755 (or 2751 counting only the distinct ones).

The product of its digits is 24192, while the sum is 37.

The square root of 21227896 is about 4607.3740894353. The cubic root of 21227896 is about 276.8868413968.

Subtracting 21227896 from its reverse (69872212), we obtain a triangular number (48644316 = T₉₈₆₃).

The spelling of 21227896 in words is "twenty-one million, two hundred twenty-seven thousand, eight hundred ninety-six".