21154545443532 has 48 divisors (see below), whose sum is σ = 49887366691680. Its totient is φ = 6976315779072.

The previous prime is 21154545443519. The next prime is 21154545443543. The reversal of 21154545443532 is 23534454545112.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11763 + ... + 6504554.

It is an arithmetic number, because the mean of its divisors is an integer number (1039320139410).

Almost surely, 2^{21154545443532} is an apocalyptic number.

It is an amenable number.

21154545443532 is an abundant number, since it is smaller than the sum of its proper divisors (28732821248148).

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

21154545443532 is a wasteful number, since it uses less digits than its factorization.

21154545443532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6519210 (or 6519208 counting only the distinct ones).

The product of its digits is 5760000, while the sum is 48.

Adding to 21154545443532 its reverse (23534454545112), we get a palindrome (44688999988644).

The spelling of 21154545443532 in words is "twenty-one trillion, one hundred fifty-four billion, five hundred forty-five million, four hundred forty-three thousand, five hundred thirty-two".