21606274363147 has 4 divisors (see below), whose sum is σ = 21902250724360. Its totient is φ = 21310298001936.

The previous prime is 21606274363139. The next prime is 21606274363151. The reversal of 21606274363147 is 74136347260612.

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 21606274363147 - 2³ = 21606274363139 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21606274363094 and 21606274363103.

It is not an unprimeable number, because it can be changed into a prime (21606274373147) 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, 147988180497 + ... + 147988180642.

It is an arithmetic number, because the mean of its divisors is an integer number (5475562681090).

Almost surely, 2^{21606274363147} is an apocalyptic number.

21606274363147 is a deficient number, since it is larger than the sum of its proper divisors (295976361213).

21606274363147 is an equidigital number, since it uses as much as digits as its factorization.

21606274363147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295976361212.

The product of its (nonzero) digits is 6096384, while the sum is 52.

The spelling of 21606274363147 in words is "twenty-one trillion, six hundred six billion, two hundred seventy-four million, three hundred sixty-three thousand, one hundred forty-seven".