21887827660 has 12 divisors (see below), whose sum is σ = 45964438128. Its totient is φ = 8755131056.

The previous prime is 21887827649. The next prime is 21887827697. The reversal of 21887827660 is 6672878812.

It is a super-2 number, since 2×21887827660² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 547195672 + ... + 547195711.

It is an arithmetic number, because the mean of its divisors is an integer number (3830369844).

Almost surely, 2^21887827660 is an apocalyptic number.

21887827660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21887827660 is an abundant number, since it is smaller than the sum of its proper divisors (24076610468).

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

21887827660 is a wasteful number, since it uses less digits than its factorization.

21887827660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1094391392 (or 1094391390 counting only the distinct ones).

The product of its (nonzero) digits is 3612672, while the sum is 55.

The spelling of 21887827660 in words is "twenty-one billion, eight hundred eighty-seven million, eight hundred twenty-seven thousand, six hundred sixty".