21540232010 has 32 divisors (see below), whose sum is σ = 42566625792. Its totient is φ = 7782914880.

The previous prime is 21540232001. The next prime is 21540232019. The reversal of 21540232010 is 1023204512.

21540232010 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (21540232001) and next prime (21540232019).

It is not an unprimeable number, because it can be changed into a prime (21540232019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 606362 + ... + 640901.

It is an arithmetic number, because the mean of its divisors is an integer number (1330207056).

Almost surely, 2^21540232010 is an apocalyptic number.

21540232010 is a deficient number, since it is larger than the sum of its proper divisors (21026393782).

21540232010 is a wasteful number, since it uses less digits than its factorization.

21540232010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1247438.

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 21540232010 its reverse (1023204512), we get a palindrome (22563436522).

The spelling of 21540232010 in words is "twenty-one billion, five hundred forty million, two hundred thirty-two thousand, ten".