21613076 has 12 divisors (see below), whose sum is σ = 39043200. Its totient is φ = 10457880.

The previous prime is 21613049. The next prime is 21613079. The reversal of 21613076 is 67031612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21613079) 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, 87026 + ... + 87273.

It is an arithmetic number, because the mean of its divisors is an integer number (3253600).

Almost surely, 2^21613076 is an apocalyptic number.

It is an amenable number.

21613076 is a deficient number, since it is larger than the sum of its proper divisors (17430124).

21613076 is a wasteful number, since it uses less digits than its factorization.

21613076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174334 (or 174332 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 21613076 is about 4648.9865562292. The cubic root of 21613076 is about 278.5515162875.

Adding to 21613076 its reverse (67031612), we get a palindrome (88644688).

The spelling of 21613076 in words is "twenty-one million, six hundred thirteen thousand, seventy-six".