21700161427 has 8 divisors (see below), whose sum is σ = 24804458496. Its totient is φ = 18596932872.

The previous prime is 21700161419. The next prime is 21700161433. The reversal of 21700161427 is 72416100712.

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

It is not a de Polignac number, because 21700161427 - 2³ = 21700161419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21700161127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 223123 + ... + 305260.

It is an arithmetic number, because the mean of its divisors is an integer number (3100557312).

Almost surely, 2^21700161427 is an apocalyptic number.

21700161427 is a deficient number, since it is larger than the sum of its proper divisors (3104297069).

21700161427 is an equidigital number, since it uses as much as digits as its factorization.

21700161427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534257.

The product of its (nonzero) digits is 4704, while the sum is 31.

The spelling of 21700161427 in words is "twenty-one billion, seven hundred million, one hundred sixty-one thousand, four hundred twenty-seven".