21231514 has 4 divisors (see below), whose sum is σ = 31847274. Its totient is φ = 10615756.

The previous prime is 21231503. The next prime is 21231523. The reversal of 21231514 is 41513212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20097289 + 1134225 = 4483^2 + 1065^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21231491 and 21231500.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5307877 + ... + 5307880.

Almost surely, 2^21231514 is an apocalyptic number.

21231514 is a deficient number, since it is larger than the sum of its proper divisors (10615760).

21231514 is a wasteful number, since it uses less digits than its factorization.

21231514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10615759.

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

The square root of 21231514 is about 4607.7667041637. The cubic root of 21231514 is about 276.9025710085.

Adding to 21231514 its reverse (41513212), we get a palindrome (62744726).

The spelling of 21231514 in words is "twenty-one million, two hundred thirty-one thousand, five hundred fourteen".