21540424030 has 32 divisors (see below), whose sum is σ = 38897418240. Its totient is φ = 8588512800.

The previous prime is 21540424001. The next prime is 21540424033. The reversal of 21540424030 is 3042404512.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21540423986 and 21540424004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21540424033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5511337 + ... + 5515243.

It is an arithmetic number, because the mean of its divisors is an integer number (1215544320).

Almost surely, 2^21540424030 is an apocalyptic number.

21540424030 is a deficient number, since it is larger than the sum of its proper divisors (17356994210).

21540424030 is a wasteful number, since it uses less digits than its factorization.

21540424030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5544.

The product of its (nonzero) digits is 3840, while the sum is 25.

Adding to 21540424030 its reverse (3042404512), we get a palindrome (24582828542).

The spelling of 21540424030 in words is "twenty-one billion, five hundred forty million, four hundred twenty-four thousand, thirty".