21011114440 has 32 divisors (see below), whose sum is σ = 47352183480. Its totient is φ = 8390725632.

The previous prime is 21011114437. The next prime is 21011114471. The reversal of 21011114440 is 4441111012.

It can be written as a sum of positive squares in 4 ways, for example, as 6908601924 + 14102512516 = 83118^2 + 118754^2 .

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, 403929 + ... + 452968.

Almost surely, 2^21011114440 is an apocalyptic number.

21011114440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21011114440 is an abundant number, since it is smaller than the sum of its proper divisors (26341069040).

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

21011114440 is a wasteful number, since it uses less digits than its factorization.

21011114440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 857521 (or 857517 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21011114440 its reverse (4441111012), we get a palindrome (25452225452).

The spelling of 21011114440 in words is "twenty-one billion, eleven million, one hundred fourteen thousand, four hundred forty".