21224155353 has 16 divisors (see below), whose sum is σ = 28907376000. Its totient is φ = 13847518080.

The previous prime is 21224155307. The next prime is 21224155391. The reversal of 21224155353 is 35355142212.

It is not a de Polignac number, because 21224155353 - 2⁹ = 21224154841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21224155153) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 254988 + ... + 327821.

It is an arithmetic number, because the mean of its divisors is an integer number (1806711000).

Almost surely, 2^21224155353 is an apocalyptic number.

It is an amenable number.

21224155353 is a deficient number, since it is larger than the sum of its proper divisors (7683220647).

21224155353 is a wasteful number, since it uses less digits than its factorization.

21224155353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583072.

The product of its digits is 36000, while the sum is 33.

Adding to 21224155353 its reverse (35355142212), we get a palindrome (56579297565).

The spelling of 21224155353 in words is "twenty-one billion, two hundred twenty-four million, one hundred fifty-five thousand, three hundred fifty-three".