21016038 has 8 divisors (see below), whose sum is σ = 42032088. Its totient is φ = 7005344.

The previous prime is 21016031. The next prime is 21016049. The reversal of 21016038 is 83061012.

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

21016038 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21016031) 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, 1751331 + ... + 1751342.

It is an arithmetic number, because the mean of its divisors is an integer number (5254011).

Almost surely, 2^21016038 is an apocalyptic number.

21016038 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21016038 is a wasteful number, since it uses less digits than its factorization.

21016038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3502678.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 21016038 is about 4584.3252502413. The cubic root of 21016038 is about 275.9626340929.

The spelling of 21016038 in words is "twenty-one million, sixteen thousand, thirty-eight".