21240762 has 8 divisors (see below), whose sum is σ = 42481536. Its totient is φ = 7080252.

The previous prime is 21240761. The next prime is 21240781. The reversal of 21240762 is 26704212.

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

21240762 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21240761) 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, 1770058 + ... + 1770069.

It is an arithmetic number, because the mean of its divisors is an integer number (5310192).

Almost surely, 2^21240762 is an apocalyptic number.

21240762 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.

21240762 is a wasteful number, since it uses less digits than its factorization.

21240762 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3540132.

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 21240762 is about 4608.7701179382. The cubic root of 21240762 is about 276.9427694804.

Adding to 21240762 its reverse (26704212), we get a palindrome (47944974).

The spelling of 21240762 in words is "twenty-one million, two hundred forty thousand, seven hundred sixty-two".