21232145104 has 20 divisors (see below), whose sum is σ = 43557121764. Its totient is φ = 9991597568.

The previous prime is 21232145059. The next prime is 21232145167. The reversal of 21232145104 is 40154123212.

It can be written as a sum of positive squares in 2 ways, for example, as 16012371600 + 5219773504 = 126540^2 + 72248^2 .

It is a super-2 number, since 2×21232145104² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39029407 + ... + 39029950.

Almost surely, 2^21232145104 is an apocalyptic number.

It is an amenable number.

21232145104 is an abundant number, since it is smaller than the sum of its proper divisors (22324976660).

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

21232145104 is a wasteful number, since it uses less digits than its factorization.

21232145104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78059382 (or 78059376 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 21232145104 its reverse (40154123212), we get a palindrome (61386268316).

The spelling of 21232145104 in words is "twenty-one billion, two hundred thirty-two million, one hundred forty-five thousand, one hundred four".