21063773147 has 4 divisors (see below), whose sum is σ = 21104203176. Its totient is φ = 21023343120.

The previous prime is 21063773123. The next prime is 21063773167. The reversal of 21063773147 is 74137736012.

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 21063773147 - 2¹⁶ = 21063707611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21063773167) 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, 20214233 + ... + 20215274.

It is an arithmetic number, because the mean of its divisors is an integer number (5276050794).

Almost surely, 2^21063773147 is an apocalyptic number.

21063773147 is a deficient number, since it is larger than the sum of its proper divisors (40430029).

21063773147 is an equidigital number, since it uses as much as digits as its factorization.

21063773147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40430028.

The product of its (nonzero) digits is 148176, while the sum is 41.

The spelling of 21063773147 in words is "twenty-one billion, sixty-three million, seven hundred seventy-three thousand, one hundred forty-seven".