21614356 has 6 divisors (see below), whose sum is σ = 37825130. Its totient is φ = 10807176.

The previous prime is 21614261. The next prime is 21614357. The reversal of 21614356 is 65341612.

It can be written as a sum of positive squares in only one way, i.e., 11155600 + 10458756 = 3340^2 + 3234^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21614357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2701791 + ... + 2701798.

Almost surely, 2^21614356 is an apocalyptic number.

It is an amenable number.

21614356 is a deficient number, since it is larger than the sum of its proper divisors (16210774).

21614356 is a wasteful number, since it uses less digits than its factorization.

21614356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5403593 (or 5403591 counting only the distinct ones).

The product of its digits is 4320, while the sum is 28.

The square root of 21614356 is about 4649.1242186029. The cubic root of 21614356 is about 278.5570151022.

Adding to 21614356 its reverse (65341612), we get a palindrome (86955968).

The spelling of 21614356 in words is "twenty-one million, six hundred fourteen thousand, three hundred fifty-six".