21820843140 has 48 divisors (see below), whose sum is σ = 62099983680. Its totient is φ = 5723498880.

The previous prime is 21820843133. The next prime is 21820843159. The reversal of 21820843140 is 4134802812.

It is a super-2 number, since 2×21820843140² (a number of 21 digits) contains 22 as substring.

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, 2977330 + ... + 2984649.

It is an arithmetic number, because the mean of its divisors is an integer number (1293749660).

Almost surely, 2^21820843140 is an apocalyptic number.

21820843140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21820843140 is an abundant number, since it is smaller than the sum of its proper divisors (40279140540).

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

21820843140 is a wasteful number, since it uses less digits than its factorization.

21820843140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5962052 (or 5962050 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 33.

The spelling of 21820843140 in words is "twenty-one billion, eight hundred twenty million, eight hundred forty-three thousand, one hundred forty".