21010543366 has 16 divisors (see below), whose sum is σ = 31965643008. Its totient is φ = 10355384200.

The previous prime is 21010543363. The next prime is 21010543397. The reversal of 21010543366 is 66334501012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010543361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1030911 + ... + 1051093.

It is an arithmetic number, because the mean of its divisors is an integer number (1997852688).

Almost surely, 2^21010543366 is an apocalyptic number.

21010543366 is a deficient number, since it is larger than the sum of its proper divisors (10955099642).

21010543366 is a wasteful number, since it uses less digits than its factorization.

21010543366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27587.

The product of its (nonzero) digits is 12960, while the sum is 31.

The spelling of 21010543366 in words is "twenty-one billion, ten million, five hundred forty-three thousand, three hundred sixty-six".