21413022540 has 288 divisors, whose sum is σ = 78379176960. Its totient is φ = 4321304064.

The previous prime is 21413022457. The next prime is 21413022559. The reversal of 21413022540 is 4522031412.

It is a self number, because there is not a number n which added to its sum of digits gives 21413022540.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 866881 + ... + 891239.

It is an arithmetic number, because the mean of its divisors is an integer number (272149920).

Almost surely, 2^21413022540 is an apocalyptic number.

21413022540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21413022540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39189588480).

21413022540 is an abundant number, since it is smaller than the sum of its proper divisors (56966154420).

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

21413022540 is a wasteful number, since it uses less digits than its factorization.

21413022540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24421 (or 24412 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

Adding to 21413022540 its reverse (4522031412), we get a palindrome (25935053952).

The spelling of 21413022540 in words is "twenty-one billion, four hundred thirteen million, twenty-two thousand, five hundred forty".