21224403351 has 40 divisors (see below), whose sum is σ = 32599305024. Its totient is φ = 13751622720.

The previous prime is 21224403341. The next prime is 21224403353. The reversal of 21224403351 is 15330442212.

21224403351 is a `hidden beast` number, since 2 + 1 + 224 + 403 + 35 + 1 = 666.

It is not a de Polignac number, because 21224403351 - 2¹⁸ = 21224141207 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21224403353) 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 39 ways as a sum of consecutive naturals, for example, 3032466 + ... + 3039456.

Almost surely, 2^21224403351 is an apocalyptic number.

21224403351 is a deficient number, since it is larger than the sum of its proper divisors (11374901673).

21224403351 is a wasteful number, since it uses less digits than its factorization.

21224403351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8053 (or 8044 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

Adding to 21224403351 its reverse (15330442212), we get a palindrome (36554845563).

The spelling of 21224403351 in words is "twenty-one billion, two hundred twenty-four million, four hundred three thousand, three hundred fifty-one".