21154023546 has 16 divisors (see below), whose sum is σ = 42310786944. Its totient is φ = 7050884544.

The previous prime is 21154023511. The next prime is 21154023557. The reversal of 21154023546 is 64532045112.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 5890 + ... + 205773.

It is an arithmetic number, because the mean of its divisors is an integer number (2644424184).

Almost surely, 2^21154023546 is an apocalyptic number.

21154023546 is an abundant number, since it is smaller than the sum of its proper divisors (21156763398).

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

21154023546 is a wasteful number, since it uses less digits than its factorization.

21154023546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228325.

The product of its (nonzero) digits is 28800, while the sum is 33.

Adding to 21154023546 its reverse (64532045112), we get a palindrome (85686068658).

The spelling of 21154023546 in words is "twenty-one billion, one hundred fifty-four million, twenty-three thousand, five hundred forty-six".