21763945437820 has 48 divisors (see below), whose sum is σ = 45837904795200. Its totient is φ = 8680129767936.

The previous prime is 21763945437797. The next prime is 21763945437851. The reversal of 21763945437820 is 2873454936712.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134444649 + ... + 134606431.

It is an arithmetic number, because the mean of its divisors is an integer number (954956349900).

It is a 1-persistent number, because it is pandigital, but 2⋅21763945437820 = 43527890875640 is not.

Almost surely, 2^{21763945437820} is an apocalyptic number.

21763945437820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21763945437820 is an abundant number, since it is smaller than the sum of its proper divisors (24073959357380).

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

21763945437820 is a wasteful number, since it uses less digits than its factorization.

21763945437820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181414 (or 181412 counting only the distinct ones).

The product of its (nonzero) digits is 60963840, while the sum is 61.

The spelling of 21763945437820 in words is "twenty-one trillion, seven hundred sixty-three billion, nine hundred forty-five million, four hundred thirty-seven thousand, eight hundred twenty".