21279468 has 96 divisors (see below), whose sum is σ = 60928000. Its totient is φ = 5645376.

The previous prime is 21279463. The next prime is 21279469. The reversal of 21279468 is 86497212.

It is not an unprimeable number, because it can be changed into a prime (21279463) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 106833 + ... + 107031.

Almost surely, 2^21279468 is an apocalyptic number.

21279468 is a gapful number since it is divisible by the number (28) 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 21279468, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30464000).

21279468 is an abundant number, since it is smaller than the sum of its proper divisors (39648532).

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

21279468 is a wasteful number, since it uses less digits than its factorization.

21279468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299 (or 297 counting only the distinct ones).

The product of its digits is 48384, while the sum is 39.

The square root of 21279468 is about 4612.9673746949. The cubic root of 21279468 is about 277.1108871513.

The spelling of 21279468 in words is "twenty-one million, two hundred seventy-nine thousand, four hundred sixty-eight".