21224431076 has 6 divisors (see below), whose sum is σ = 37142754390. Its totient is φ = 10612215536.

The previous prime is 21224431069. The next prime is 21224431097. The reversal of 21224431076 is 67013442212.

It can be written as a sum of positive squares in only one way, i.e., 12939062500 + 8285368576 = 113750^2 + 91024^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 2653053881 + ... + 2653053888.

It is an arithmetic number, because the mean of its divisors is an integer number (6190459065).

Almost surely, 2^21224431076 is an apocalyptic number.

It is an amenable number.

21224431076 is a deficient number, since it is larger than the sum of its proper divisors (15918323314).

21224431076 is a wasteful number, since it uses less digits than its factorization.

21224431076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5306107773 (or 5306107771 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 32.

Adding to 21224431076 its reverse (67013442212), we get a palindrome (88237873288).

The spelling of 21224431076 in words is "twenty-one billion, two hundred twenty-four million, four hundred thirty-one thousand, seventy-six".