21054353522 has 4 divisors (see below), whose sum is σ = 31581530286. Its totient is φ = 10527176760.

The previous prime is 21054353521. The next prime is 21054353611. The reversal of 21054353522 is 22535345012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 13881788041 + 7172565481 = 117821^2 + 84691^2 .

It is not an unprimeable number, because it can be changed into a prime (21054353521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5263588379 + ... + 5263588382.

Almost surely, 2^21054353522 is an apocalyptic number.

21054353522 is a deficient number, since it is larger than the sum of its proper divisors (10527176764).

21054353522 is a wasteful number, since it uses less digits than its factorization.

21054353522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10527176763.

The product of its (nonzero) digits is 36000, while the sum is 32.

Adding to 21054353522 its reverse (22535345012), we get a palindrome (43589698534).

The spelling of 21054353522 in words is "twenty-one billion, fifty-four million, three hundred fifty-three thousand, five hundred twenty-two".