21223251514 has 16 divisors (see below), whose sum is σ = 31900409640. Its totient is φ = 10589806080.

The previous prime is 21223251509. The next prime is 21223251523. The reversal of 21223251514 is 41515232212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 20788737489 + 434514025 = 144183^2 + 20845^2 .

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, 2079504 + ... + 2089684.

Almost surely, 2^21223251514 is an apocalyptic number.

21223251514 is a deficient number, since it is larger than the sum of its proper divisors (10677158126).

21223251514 is a wasteful number, since it uses less digits than its factorization.

21223251514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12225.

The product of its digits is 4800, while the sum is 28.

Adding to 21223251514 its reverse (41515232212), we get a palindrome (62738483726).

The spelling of 21223251514 in words is "twenty-one billion, two hundred twenty-three million, two hundred fifty-one thousand, five hundred fourteen".