21531614 has 12 divisors (see below), whose sum is σ = 34973496. Its totient is φ = 9937512.

The previous prime is 21531599. The next prime is 21531619. The reversal of 21531614 is 41613512.

It is a super-2 number, since 2×21531614² = 927220802889992, which contains 22 as substring.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 21531614.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21531619) 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 5 ways as a sum of consecutive naturals, for example, 31514 + ... + 32189.

It is an arithmetic number, because the mean of its divisors is an integer number (2914458).

Almost surely, 2^21531614 is an apocalyptic number.

21531614 is a deficient number, since it is larger than the sum of its proper divisors (13441882).

21531614 is a wasteful number, since it uses less digits than its factorization.

21531614 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63731 (or 63718 counting only the distinct ones).

The product of its digits is 720, while the sum is 23.

The square root of 21531614 is about 4640.2170207869. The cubic root of 21531614 is about 278.2011121742.

The spelling of 21531614 in words is "twenty-one million, five hundred thirty-one thousand, six hundred fourteen".