21075621055361 has 8 divisors (see below), whose sum is σ = 21796494712320. Its totient is φ = 20366099739648.

The previous prime is 21075621055319. The next prime is 21075621055367. The reversal of 21075621055361 is 16355012657012.

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

It is a cyclic number.

It is not a de Polignac number, because 21075621055361 - 2¹⁴ = 21075621038977 is a prime.

It is a super-2 number, since 2×21075621055361² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21075621055367) 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, 2838081536 + ... + 2838088961.

It is an arithmetic number, because the mean of its divisors is an integer number (2724561839040).

Almost surely, 2^{21075621055361} is an apocalyptic number.

It is an amenable number.

21075621055361 is a deficient number, since it is larger than the sum of its proper divisors (720873656959).

21075621055361 is an equidigital number, since it uses as much as digits as its factorization.

21075621055361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5676170623.

The product of its (nonzero) digits is 378000, while the sum is 44.

The spelling of 21075621055361 in words is "twenty-one trillion, seventy-five billion, six hundred twenty-one million, fifty-five thousand, three hundred sixty-one".