21294063 has 32 divisors (see below), whose sum is σ = 36664320. Its totient is φ = 11962080.

The previous prime is 21294029. The next prime is 21294089. The reversal of 21294063 is 36049212.

It is not a de Polignac number, because 21294063 - 2¹⁰ = 21293039 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21294263) 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, 10606 + ... + 12452.

It is an arithmetic number, because the mean of its divisors is an integer number (1145760).

Almost surely, 2^21294063 is an apocalyptic number.

21294063 is a deficient number, since it is larger than the sum of its proper divisors (15370257).

21294063 is a wasteful number, since it uses less digits than its factorization.

21294063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1924 (or 1918 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 21294063 is about 4614.5490570586. The cubic root of 21294063 is about 277.1742269098.

The spelling of 21294063 in words is "twenty-one million, two hundred ninety-four thousand, sixty-three".