21090477543 has 16 divisors (see below), whose sum is σ = 28315422720. Its totient is φ = 13963242944.

The previous prime is 21090477497. The next prime is 21090477571. The reversal of 21090477543 is 34577409012.

It is a cyclic number.

It is not a de Polignac number, because 21090477543 - 2¹² = 21090473447 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21090477495 and 21090477504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21090477043) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 228328 + ... + 307106.

It is an arithmetic number, because the mean of its divisors is an integer number (1769713920).

Almost surely, 2^21090477543 is an apocalyptic number.

21090477543 is a deficient number, since it is larger than the sum of its proper divisors (7224945177).

21090477543 is a wasteful number, since it uses less digits than its factorization.

21090477543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79398.

The product of its (nonzero) digits is 211680, while the sum is 42.

The spelling of 21090477543 in words is "twenty-one billion, ninety million, four hundred seventy-seven thousand, five hundred forty-three".