21345054312 has 16 divisors (see below), whose sum is σ = 53362635840. Its totient is φ = 7115018096.

The previous prime is 21345054299. The next prime is 21345054317.

21345054312 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×21345054312² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21345054312.

It is not an unprimeable number, because it can be changed into a prime (21345054317) 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, 444688608 + ... + 444688655.

It is an arithmetic number, because the mean of its divisors is an integer number (3335164740).

Almost surely, 2^21345054312 is an apocalyptic number.

It is an amenable number.

21345054312 is an abundant number, since it is smaller than the sum of its proper divisors (32017581528).

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

21345054312 is a wasteful number, since it uses less digits than its factorization.

21345054312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 889377272 (or 889377268 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

It can be divided in two parts, 213450 and 54312, that added together give a palindrome (267762).

The spelling of 21345054312 in words is "twenty-one billion, three hundred forty-five million, fifty-four thousand, three hundred twelve".