21602350740647 has 4 divisors (see below), whose sum is σ = 21657883776360. Its totient is φ = 21546817704936.

The previous prime is 21602350740637. The next prime is 21602350740653. The reversal of 21602350740647 is 74604705320612.

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 21602350740647 - 2⁸ = 21602350740391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21602350740637) 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, 27766517273 + ... + 27766518050.

It is an arithmetic number, because the mean of its divisors is an integer number (5414470944090).

Almost surely, 2^{21602350740647} is an apocalyptic number.

21602350740647 is a deficient number, since it is larger than the sum of its proper divisors (55533035713).

21602350740647 is an equidigital number, since it uses as much as digits as its factorization.

21602350740647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55533035712.

The product of its (nonzero) digits is 1693440, while the sum is 47.

The spelling of 21602350740647 in words is "twenty-one trillion, six hundred two billion, three hundred fifty million, seven hundred forty thousand, six hundred forty-seven".