21614531 has 8 divisors (see below), whose sum is σ = 22929984. Its totient is φ = 20304000.

The previous prime is 21614519. The next prime is 21614539. The reversal of 21614531 is 13541612.

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

It is a cyclic number.

It is not a de Polignac number, because 21614531 - 2¹⁴ = 21598147 is a prime.

It is a super-2 number, since 2×21614531² = 934375900699922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21614497 and 21614506.

It is not an unprimeable number, because it can be changed into a prime (21614539) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11921 + ... + 13613.

It is an arithmetic number, because the mean of its divisors is an integer number (2866248).

Almost surely, 2^21614531 is an apocalyptic number.

21614531 is a deficient number, since it is larger than the sum of its proper divisors (1315453).

21614531 is a wasteful number, since it uses less digits than its factorization.

21614531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2461.

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

The square root of 21614531 is about 4649.1430393138. The cubic root of 21614531 is about 278.5577668764.

The spelling of 21614531 in words is "twenty-one million, six hundred fourteen thousand, five hundred thirty-one".