21620546462271 has 4 divisors (see below), whose sum is σ = 28827395283032. Its totient is φ = 14413697641512.

The previous prime is 21620546462269. The next prime is 21620546462299. The reversal of 21620546462271 is 17226464502612.

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

It is not a de Polignac number, because 21620546462271 - 2¹ = 21620546462269 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21620546462271.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21620546462231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3603424410376 + ... + 3603424410381.

It is an arithmetic number, because the mean of its divisors is an integer number (7206848820758).

Almost surely, 2^{21620546462271} is an apocalyptic number.

21620546462271 is a deficient number, since it is larger than the sum of its proper divisors (7206848820761).

21620546462271 is an equidigital number, since it uses as much as digits as its factorization.

21620546462271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7206848820760.

The product of its (nonzero) digits is 1935360, while the sum is 48.

The spelling of 21620546462271 in words is "twenty-one trillion, six hundred twenty billion, five hundred forty-six million, four hundred sixty-two thousand, two hundred seventy-one".