21141204440 has 64 divisors (see below), whose sum is σ = 48132580320. Its totient is φ = 8356608000.

The previous prime is 21141204407. The next prime is 21141204463. The reversal of 21141204440 is 4440214112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1254470 + ... + 1271210.

Almost surely, 2^21141204440 is an apocalyptic number.

21141204440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21141204440 is an abundant number, since it is smaller than the sum of its proper divisors (26991375880).

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

21141204440 is a wasteful number, since it uses less digits than its factorization.

21141204440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17124 (or 17120 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 21141204440 its reverse (4440214112), we get a palindrome (25581418552).

The spelling of 21141204440 in words is "twenty-one billion, one hundred forty-one million, two hundred four thousand, four hundred forty".