21541255532 has 6 divisors (see below), whose sum is σ = 37697197188. Its totient is φ = 10770627764.

The previous prime is 21541255511. The next prime is 21541255579. The reversal of 21541255532 is 23555214512.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21541255492 and 21541255501.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2692656938 + ... + 2692656945.

It is an arithmetic number, because the mean of its divisors is an integer number (6282866198).

Almost surely, 2^21541255532 is an apocalyptic number.

It is an amenable number.

21541255532 is a deficient number, since it is larger than the sum of its proper divisors (16155941656).

21541255532 is a wasteful number, since it uses less digits than its factorization.

21541255532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5385313887 (or 5385313885 counting only the distinct ones).

The product of its digits is 60000, while the sum is 35.

The spelling of 21541255532 in words is "twenty-one billion, five hundred forty-one million, two hundred fifty-five thousand, five hundred thirty-two".