21849361880 has 32 divisors (see below), whose sum is σ = 50207048640. Its totient is φ = 8553792000.

The previous prime is 21849361873. The next prime is 21849361889. The reversal of 21849361880 is 8816394812.

It is a super-2 number, since 2×21849361880² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21849361889) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 5809121 + ... + 5812880.

It is an arithmetic number, because the mean of its divisors is an integer number (1568970270).

Almost surely, 2^21849361880 is an apocalyptic number.

21849361880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21849361880 is an abundant number, since it is smaller than the sum of its proper divisors (28357686760).

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

21849361880 is a wasteful number, since it uses less digits than its factorization.

21849361880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11622059 (or 11622055 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 50.

The spelling of 21849361880 in words is "twenty-one billion, eight hundred forty-nine million, three hundred sixty-one thousand, eight hundred eighty".