21613030 has 8 divisors (see below), whose sum is σ = 38903472. Its totient is φ = 8645208.

The previous prime is 21613019. The next prime is 21613043. The reversal of 21613030 is 3031612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21612995 and 21613013.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1080642 + ... + 1080661.

It is an arithmetic number, because the mean of its divisors is an integer number (4862934).

Almost surely, 2^21613030 is an apocalyptic number.

21613030 is a deficient number, since it is larger than the sum of its proper divisors (17290442).

21613030 is a wasteful number, since it uses less digits than its factorization.

21613030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2161310.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 21613030 is about 4648.9816089118. The cubic root of 21613030 is about 278.5513186698.

Adding to 21613030 its reverse (3031612), we get a palindrome (24644642).

The spelling of 21613030 in words is "twenty-one million, six hundred thirteen thousand, thirty".