21771331120 has 120 divisors (see below), whose sum is σ = 64235652048. Its totient is φ = 6785856000.

The previous prime is 21771331097. The next prime is 21771331133. The reversal of 21771331120 is 2113317712.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 209331 + ... + 295570.

Almost surely, 2^21771331120 is an apocalyptic number.

21771331120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21771331120 is an abundant number, since it is smaller than the sum of its proper divisors (42464320928).

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

21771331120 is a wasteful number, since it uses less digits than its factorization.

21771331120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 504939 (or 504926 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 28.

Adding to 21771331120 its reverse (2113317712), we get a palindrome (23884648832).

The spelling of 21771331120 in words is "twenty-one billion, seven hundred seventy-one million, three hundred thirty-one thousand, one hundred twenty".