21063188 has 12 divisors (see below), whose sum is σ = 36893472. Its totient is φ = 10522200.

The previous prime is 21063181. The next prime is 21063199. The reversal of 21063188 is 88136012.

It is a self number, because there is not a number n which added to its sum of digits gives 21063188.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21063181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5963 + ... + 8813.

It is an arithmetic number, because the mean of its divisors is an integer number (3074456).

Almost surely, 2^21063188 is an apocalyptic number.

It is an amenable number.

21063188 is a deficient number, since it is larger than the sum of its proper divisors (15830284).

21063188 is a wasteful number, since it uses less digits than its factorization.

21063188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4702 (or 4700 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 21063188 is about 4589.4648925556. The cubic root of 21063188 is about 276.1688562753.

The spelling of 21063188 in words is "twenty-one million, sixty-three thousand, one hundred eighty-eight".