21186135561651 has 8 divisors (see below), whose sum is σ = 29011645093584. Its totient is φ = 13742358202080.

The previous prime is 21186135561611. The next prime is 21186135561653. The reversal of 21186135561651 is 15616553168112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21186135561651 - 2¹⁸ = 21186135299507 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21186135561594 and 21186135561603.

It is not an unprimeable number, because it can be changed into a prime (21186135561653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95433042960 + ... + 95433043181.

It is an arithmetic number, because the mean of its divisors is an integer number (3626455636698).

Almost surely, 2^{21186135561651} is an apocalyptic number.

21186135561651 is a deficient number, since it is larger than the sum of its proper divisors (7825509531933).

21186135561651 is a wasteful number, since it uses less digits than its factorization.

21186135561651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190866086181.

The product of its digits is 1296000, while the sum is 51.

The spelling of 21186135561651 in words is "twenty-one trillion, one hundred eighty-six billion, one hundred thirty-five million, five hundred sixty-one thousand, six hundred fifty-one".