21345222536 has 16 divisors (see below), whose sum is σ = 43660682640. Its totient is φ = 9702373840.

The previous prime is 21345222533. The next prime is 21345222551. The reversal of 21345222536 is 63522254312.

It is a super-2 number, since 2×21345222536² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21345222496 and 21345222505.

It is not an unprimeable number, because it can be changed into a prime (21345222533) 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 3 ways as a sum of consecutive naturals, for example, 121279586 + ... + 121279761.

It is an arithmetic number, because the mean of its divisors is an integer number (2728792665).

Almost surely, 2^21345222536 is an apocalyptic number.

It is an amenable number.

21345222536 is an abundant number, since it is smaller than the sum of its proper divisors (22315460104).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21345222536 is a wasteful number, since it uses less digits than its factorization.

21345222536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242559364 (or 242559360 counting only the distinct ones).

The product of its digits is 86400, while the sum is 35.

Adding to 21345222536 its reverse (63522254312), we get a palindrome (84867476848).

The spelling of 21345222536 in words is "twenty-one billion, three hundred forty-five million, two hundred twenty-two thousand, five hundred thirty-six".