21803860380 has 48 divisors (see below), whose sum is σ = 61531545600. Its totient is φ = 5768578368.

The previous prime is 21803860363. The next prime is 21803860399. The reversal of 21803860380 is 8306830812.

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, 1423080 + ... + 1438319.

It is an arithmetic number, because the mean of its divisors is an integer number (1281907200).

Almost surely, 2^21803860380 is an apocalyptic number.

21803860380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21803860380 is an abundant number, since it is smaller than the sum of its proper divisors (39727685220).

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

21803860380 is a wasteful number, since it uses less digits than its factorization.

21803860380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2861538 (or 2861536 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 39.

The spelling of 21803860380 in words is "twenty-one billion, eight hundred three million, eight hundred sixty thousand, three hundred eighty".