21787533578712 has 64 divisors (see below), whose sum is σ = 59487840696960. Its totient is φ = 6594805728000.

The previous prime is 21787533578683. The next prime is 21787533578731.

21787533578712 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (66).

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, 46498789 + ... + 46965012.

It is an arithmetic number, because the mean of its divisors is an integer number (929497510890).

Almost surely, 2^{21787533578712} is an apocalyptic number.

21787533578712 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21787533578712 is an abundant number, since it is smaller than the sum of its proper divisors (37700307118248).

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

21787533578712 is a wasteful number, since it uses less digits than its factorization.

21787533578712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93464704 (or 93464700 counting only the distinct ones).

The product of its digits is 138297600, while the sum is 66.

The spelling of 21787533578712 in words is "twenty-one trillion, seven hundred eighty-seven billion, five hundred thirty-three million, five hundred seventy-eight thousand, seven hundred twelve".