21675781308132 has 144 divisors (see below), whose sum is σ = 64941049671680. Its totient is φ = 6192803188512.

The previous prime is 21675781308113. The next prime is 21675781308133. The reversal of 21675781308132 is 23180318757612.

21675781308132 is a `hidden beast` number, since 2 + 1 + 6 + 7 + 578 + 1 + 30 + 8 + 1 + 32 = 666.

It is a super-3 number, since 3×21675781308132³ (a number of 41 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (21675781308133) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 188678733 + ... + 188793579.

Almost surely, 2^{21675781308132} is an apocalyptic number.

It is an amenable number.

21675781308132 is an abundant number, since it is smaller than the sum of its proper divisors (43265268363548).

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

21675781308132 is a wasteful number, since it uses less digits than its factorization.

21675781308132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142612 (or 142598 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 54.

The spelling of 21675781308132 in words is "twenty-one trillion, six hundred seventy-five billion, seven hundred eighty-one million, three hundred eight thousand, one hundred thirty-two".