21047057989627 has 4 divisors (see below), whose sum is σ = 21056611808440. Its totient is φ = 21037504170816.

The previous prime is 21047057989603. The next prime is 21047057989631. The reversal of 21047057989627 is 72698975074012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21047057989627 - 2¹⁹ = 21047057465339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21047057989697) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4776906102 + ... + 4776910507.

It is an arithmetic number, because the mean of its divisors is an integer number (5264152952110).

Almost surely, 2^{21047057989627} is an apocalyptic number.

21047057989627 is a deficient number, since it is larger than the sum of its proper divisors (9553818813).

21047057989627 is an equidigital number, since it uses as much as digits as its factorization.

21047057989627 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9553818812.

The product of its (nonzero) digits is 106686720, while the sum is 67.

The spelling of 21047057989627 in words is "twenty-one trillion, forty-seven billion, fifty-seven million, nine hundred eighty-nine thousand, six hundred twenty-seven".