21469380 has 24 divisors (see below), whose sum is σ = 60114432. Its totient is φ = 5725152.

The previous prime is 21469379. The next prime is 21469397. The reversal of 21469380 is 8396412.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 178852 + ... + 178971.

It is an arithmetic number, because the mean of its divisors is an integer number (2504768).

Almost surely, 2^21469380 is an apocalyptic number.

21469380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21469380 is an abundant number, since it is smaller than the sum of its proper divisors (38645052).

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

21469380 is a wasteful number, since it uses less digits than its factorization.

21469380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357835 (or 357833 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 21469380 is about 4633.5062317860. The cubic root of 21469380 is about 277.9328202317.

The spelling of 21469380 in words is "twenty-one million, four hundred sixty-nine thousand, three hundred eighty".