21541203364 has 24 divisors (see below), whose sum is σ = 39948161400. Its totient is φ = 10145560320.

The previous prime is 21541203361. The next prime is 21541203373. The reversal of 21541203364 is 46330214512.

It can be written as a sum of positive squares in 4 ways, for example, as 576480100 + 20964723264 = 24010^2 + 144792^2 .

It is not an unprimeable number, because it can be changed into a prime (21541203361) by changing a digit.

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, 2259879 + ... + 2269390.

It is an arithmetic number, because the mean of its divisors is an integer number (1664506725).

Almost surely, 2^21541203364 is an apocalyptic number.

It is an amenable number.

21541203364 is a deficient number, since it is larger than the sum of its proper divisors (18406958036).

21541203364 is a wasteful number, since it uses less digits than its factorization.

21541203364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4529343 (or 4529341 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

Adding to 21541203364 its reverse (46330214512), we get a palindrome (67871417876).

The spelling of 21541203364 in words is "twenty-one billion, five hundred forty-one million, two hundred three thousand, three hundred sixty-four".