21514231 has 8 divisors (see below), whose sum is σ = 22823424. Its totient is φ = 20209920.

The previous prime is 21514211. The next prime is 21514247. The reversal of 21514231 is 13241512.

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 21514231 - 2¹³ = 21506039 is a prime.

It is a super-2 number, since 2×21514231² = 925724271042722, 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 = 21514199 and 21514208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21514211) 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, 12106 + ... + 13768.

It is an arithmetic number, because the mean of its divisors is an integer number (2852928).

Almost surely, 2^21514231 is an apocalyptic number.

21514231 is a deficient number, since it is larger than the sum of its proper divisors (1309193).

21514231 is a wasteful number, since it uses less digits than its factorization.

21514231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2441.

The product of its digits is 240, while the sum is 19.

The square root of 21514231 is about 4638.3435620920. The cubic root of 21514231 is about 278.1262258247.

Adding to 21514231 its reverse (13241512), we get a palindrome (34755743).

The spelling of 21514231 in words is "twenty-one million, five hundred fourteen thousand, two hundred thirty-one".