21003676 has 6 divisors (see below), whose sum is σ = 36756440. Its totient is φ = 10501836.

The previous prime is 21003673. The next prime is 21003677. The reversal of 21003676 is 67630012.

It is a self number, because there is not a number n which added to its sum of digits gives 21003676.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21003673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2625456 + ... + 2625463.

Almost surely, 2^21003676 is an apocalyptic number.

It is an amenable number.

21003676 is a deficient number, since it is larger than the sum of its proper divisors (15752764).

21003676 is a wasteful number, since it uses less digits than its factorization.

21003676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5250923 (or 5250921 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 21003676 is about 4582.9767618874. The cubic root of 21003676 is about 275.9085148025.

Adding to 21003676 its reverse (67630012), we get a palindrome (88633688).

It can be divided in two parts, 2100 and 3676, that added together give a square (5776 = 76²).

The spelling of 21003676 in words is "twenty-one million, three thousand, six hundred seventy-six".