21540154032 has 60 divisors (see below), whose sum is σ = 60545849520. Its totient is φ = 7148686464.

The previous prime is 21540154001. The next prime is 21540154039. The reversal of 21540154032 is 23045104512.

21540154032 is a `hidden beast` number, since 215 + 40 + 1 + 5 + 403 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 21540153987 and 21540154005.

It is not an unprimeable number, because it can be changed into a prime (21540154039) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 293628 + ... + 359579.

It is an arithmetic number, because the mean of its divisors is an integer number (1009097492).

Almost surely, 2^21540154032 is an apocalyptic number.

It is an amenable number.

21540154032 is an abundant number, since it is smaller than the sum of its proper divisors (39005695488).

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

21540154032 is a wasteful number, since it uses less digits than its factorization.

21540154032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653450 (or 653441 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

Adding to 21540154032 its reverse (23045104512), we get a palindrome (44585258544).

The spelling of 21540154032 in words is "twenty-one billion, five hundred forty million, one hundred fifty-four thousand, thirty-two".