21614813 has 4 divisors (see below), whose sum is σ = 23579808. Its totient is φ = 19649820.

The previous prime is 21614797. The next prime is 21614819. The reversal of 21614813 is 31841612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21614813 - 2⁴ = 21614797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21614819) by changing a digit.

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, 982481 + ... + 982502.

It is an arithmetic number, because the mean of its divisors is an integer number (5894952).

Almost surely, 2^21614813 is an apocalyptic number.

It is an amenable number.

21614813 is a deficient number, since it is larger than the sum of its proper divisors (1964995).

21614813 is a wasteful number, since it uses less digits than its factorization.

21614813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1964994.

The product of its digits is 1152, while the sum is 26.

The square root of 21614813 is about 4649.1733673848. The cubic root of 21614813 is about 278.5589782983.

The spelling of 21614813 in words is "twenty-one million, six hundred fourteen thousand, eight hundred thirteen".