21140562 has 8 divisors (see below), whose sum is σ = 42281136. Its totient is φ = 7046852.

The previous prime is 21140549. The next prime is 21140569. The reversal of 21140562 is 26504112.

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

21140562 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21140569) 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, 1761708 + ... + 1761719.

It is an arithmetic number, because the mean of its divisors is an integer number (5285142).

Almost surely, 2^21140562 is an apocalyptic number.

21140562 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.

21140562 is a wasteful number, since it uses less digits than its factorization.

21140562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3523432.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 21140562 is about 4597.8866884690. The cubic root of 21140562 is about 276.5066047274.

Adding to 21140562 its reverse (26504112), we get a palindrome (47644674).

The spelling of 21140562 in words is "twenty-one million, one hundred forty thousand, five hundred sixty-two".