21263341252 has 24 divisors (see below), whose sum is σ = 38037767040. Its totient is φ = 10395827040.

The previous prime is 21263341249. The next prime is 21263341261. The reversal of 21263341252 is 25214336212.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153274 + ... + 256942.

It is an arithmetic number, because the mean of its divisors is an integer number (1584906960).

Almost surely, 2^21263341252 is an apocalyptic number.

It is an amenable number.

21263341252 is a deficient number, since it is larger than the sum of its proper divisors (16774425788).

21263341252 is a wasteful number, since it uses less digits than its factorization.

21263341252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104811 (or 104809 counting only the distinct ones).

The product of its digits is 17280, while the sum is 31.

Adding to 21263341252 its reverse (25214336212), we get a palindrome (46477677464).

The spelling of 21263341252 in words is "twenty-one billion, two hundred sixty-three million, three hundred forty-one thousand, two hundred fifty-two".