21201364 has 12 divisors (see below), whose sum is σ = 37142644. Its totient is φ = 10589184.

The previous prime is 21201347. The next prime is 21201373. The reversal of 21201364 is 46310212.

It can be written as a sum of positive squares in 2 ways, for example, as 8456464 + 12744900 = 2908^2 + 3570^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2314 + ... + 6910.

Almost surely, 2^21201364 is an apocalyptic number.

It is an amenable number.

21201364 is a deficient number, since it is larger than the sum of its proper divisors (15941280).

21201364 is a wasteful number, since it uses less digits than its factorization.

21201364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5754 (or 5752 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 21201364 is about 4604.4938918409. The cubic root of 21201364 is about 276.7714362642.

Adding to 21201364 its reverse (46310212), we get a palindrome (67511576).

The spelling of 21201364 in words is "twenty-one million, two hundred one thousand, three hundred sixty-four".