21046538 has 8 divisors (see below), whose sum is σ = 31643040. Its totient is φ = 10498860.

The previous prime is 21046537. The next prime is 21046549. The reversal of 21046538 is 83564012.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21046538.

It is not an unprimeable number, because it can be changed into a prime (21046537) 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, 11108 + ... + 12863.

It is an arithmetic number, because the mean of its divisors is an integer number (3955380).

Almost surely, 2^21046538 is an apocalyptic number.

21046538 is a deficient number, since it is larger than the sum of its proper divisors (10596502).

21046538 is a wasteful number, since it uses less digits than its factorization.

21046538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24412.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 21046538 is about 4587.6505969832. The cubic root of 21046538 is about 276.0960685665.

The spelling of 21046538 in words is "twenty-one million, forty-six thousand, five hundred thirty-eight".