21443022252440 has 64 divisors (see below), whose sum is σ = 49960257096960. Its totient is φ = 8274339970560.

The previous prime is 21443022252413. The next prime is 21443022252461. The reversal of 21443022252440 is 4425222034412.

It is a super-2 number, since 2×21443022252440² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21443022252440.

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, 26882567 + ... + 27668726.

It is an arithmetic number, because the mean of its divisors is an integer number (780629017140).

Almost surely, 2^{21443022252440} is an apocalyptic number.

21443022252440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21443022252440 is an abundant number, since it is smaller than the sum of its proper divisors (28517234844520).

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

21443022252440 is a wasteful number, since it uses less digits than its factorization.

21443022252440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54551652 (or 54551648 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 35.

Adding to 21443022252440 its reverse (4425222034412), we get a palindrome (25868244286852).

The spelling of 21443022252440 in words is "twenty-one trillion, four hundred forty-three billion, twenty-two million, two hundred fifty-two thousand, four hundred forty".