21422401540 has 24 divisors (see below), whose sum is σ = 44994344472. Its totient is φ = 8567569920.

The previous prime is 21422401531. The next prime is 21422401577. The reversal of 21422401540 is 4510422412.

It can be written as a sum of positive squares in 4 ways, for example, as 900120004 + 20522281536 = 30002^2 + 143256^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44220 + ... + 211660.

It is an arithmetic number, because the mean of its divisors is an integer number (1874764353).

Almost surely, 2^21422401540 is an apocalyptic number.

21422401540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21422401540 is an abundant number, since it is smaller than the sum of its proper divisors (23571942932).

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

21422401540 is a wasteful number, since it uses less digits than its factorization.

21422401540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173847 (or 173845 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 25.

Adding to 21422401540 its reverse (4510422412), we get a palindrome (25932823952).

The spelling of 21422401540 in words is "twenty-one billion, four hundred twenty-two million, four hundred one thousand, five hundred forty".