21428363 has 8 divisors (see below), whose sum is σ = 23947056. Its totient is φ = 19004800.

The previous prime is 21428339. The next prime is 21428383. The reversal of 21428363 is 36382412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21428363 - 2¹⁰ = 21427339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21428383) 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, 23306 + ... + 24207.

It is an arithmetic number, because the mean of its divisors is an integer number (2993382).

Almost surely, 2^21428363 is an apocalyptic number.

21428363 is a deficient number, since it is larger than the sum of its proper divisors (2518693).

21428363 is a wasteful number, since it uses less digits than its factorization.

21428363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47565.

The product of its digits is 6912, while the sum is 29.

The square root of 21428363 is about 4629.0779859493. The cubic root of 21428363 is about 277.7557115923.

The spelling of 21428363 in words is "twenty-one million, four hundred twenty-eight thousand, three hundred sixty-three".