21427796 has 12 divisors (see below), whose sum is σ = 40383252. Its totient is φ = 9889728.

The previous prime is 21427787. The next prime is 21427799. The reversal of 21427796 is 69772412.

It can be written as a sum of positive squares in 2 ways, for example, as 10471696 + 10956100 = 3236^2 + 3310^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21427799) 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 3 ways as a sum of consecutive naturals, for example, 205985 + ... + 206088.

It is an arithmetic number, because the mean of its divisors is an integer number (3365271).

Almost surely, 2^21427796 is an apocalyptic number.

21427796 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21427796 is a deficient number, since it is larger than the sum of its proper divisors (18955456).

21427796 is a wasteful number, since it uses less digits than its factorization.

21427796 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412090 (or 412088 counting only the distinct ones).

The product of its digits is 42336, while the sum is 38.

The square root of 21427796 is about 4629.0167422467. The cubic root of 21427796 is about 277.7532617415.

The spelling of 21427796 in words is "twenty-one million, four hundred twenty-seven thousand, seven hundred ninety-six".