21148320027 has 4 divisors (see below), whose sum is σ = 28197760040. Its totient is φ = 14098880016.

The previous prime is 21148320023. The next prime is 21148320041. The reversal of 21148320027 is 72002384112.

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

It is not a de Polignac number, because 21148320027 - 2² = 21148320023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21148319976 and 21148320003.

It is not an unprimeable number, because it can be changed into a prime (21148320023) 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, 3524720002 + ... + 3524720007.

It is an arithmetic number, because the mean of its divisors is an integer number (7049440010).

Almost surely, 2^21148320027 is an apocalyptic number.

21148320027 is a deficient number, since it is larger than the sum of its proper divisors (7049440013).

21148320027 is an equidigital number, since it uses as much as digits as its factorization.

21148320027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7049440012.

The product of its (nonzero) digits is 5376, while the sum is 30.

The spelling of 21148320027 in words is "twenty-one billion, one hundred forty-eight million, three hundred twenty thousand, twenty-seven".