21144353522 has 16 divisors (see below), whose sum is σ = 32521786080. Its totient is φ = 10307011968.

The previous prime is 21144353459. The next prime is 21144353533. The reversal of 21144353522 is 22535344112.

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 in 7 ways as a sum of consecutive naturals, for example, 800372 + ... + 826367.

It is an arithmetic number, because the mean of its divisors is an integer number (2032611630).

Almost surely, 2^21144353522 is an apocalyptic number.

21144353522 is a deficient number, since it is larger than the sum of its proper divisors (11377432558).

21144353522 is a wasteful number, since it uses less digits than its factorization.

21144353522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1626905.

The product of its digits is 28800, while the sum is 32.

Adding to 21144353522 its reverse (22535344112), we get a palindrome (43679697634).

The spelling of 21144353522 in words is "twenty-one billion, one hundred forty-four million, three hundred fifty-three thousand, five hundred twenty-two".