21038673 has 16 divisors (see below), whose sum is σ = 30113856. Its totient is φ = 13017600.

The previous prime is 21038671. The next prime is 21038683. The reversal of 21038673 is 37683012.

It is not a de Polignac number, because 21038673 - 2¹ = 21038671 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21038673.

It is not an unprimeable number, because it can be changed into a prime (21038671) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 898 + ... + 6548.

It is an arithmetic number, because the mean of its divisors is an integer number (1882116).

Almost surely, 2^21038673 is an apocalyptic number.

It is an amenable number.

21038673 is a deficient number, since it is larger than the sum of its proper divisors (9075183).

21038673 is a wasteful number, since it uses less digits than its factorization.

21038673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5744.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 21038673 is about 4586.7933243171. The cubic root of 21038673 is about 276.0616723136.

It can be divided in two parts, 210 and 38673, that added together give a palindrome (38883).

The spelling of 21038673 in words is "twenty-one million, thirty-eight thousand, six hundred seventy-three".