21152514 has 8 divisors (see below), whose sum is σ = 42305040. Its totient is φ = 7050836.

The previous prime is 21152507. The next prime is 21152519. The reversal of 21152514 is 41525112.

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

21152514 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21152519) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1762704 + ... + 1762715.

It is an arithmetic number, because the mean of its divisors is an integer number (5288130).

Almost surely, 2^21152514 is an apocalyptic number.

21152514 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21152514 is a wasteful number, since it uses less digits than its factorization.

21152514 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3525424.

The product of its digits is 400, while the sum is 21.

The square root of 21152514 is about 4599.1862323676. The cubic root of 21152514 is about 276.5587033792.

Adding to 21152514 its reverse (41525112), we get a palindrome (62677626).

It can be divided in two parts, 211 and 52514, that added together give a palindrome (52725).

The spelling of 21152514 in words is "twenty-one million, one hundred fifty-two thousand, five hundred fourteen".