21428624445677 has 4 divisors (see below), whose sum is σ = 21791821470240. Its totient is φ = 21065427421116.

The previous prime is 21428624445659. The next prime is 21428624445689. The reversal of 21428624445677 is 77654442682412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21428624445677 - 2⁸ = 21428624445421 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 (21428624445637) 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, 181598512193 + ... + 181598512310.

It is an arithmetic number, because the mean of its divisors is an integer number (5447955367560).

Almost surely, 2^{21428624445677} is an apocalyptic number.

It is an amenable number.

21428624445677 is a deficient number, since it is larger than the sum of its proper divisors (363197024563).

21428624445677 is an equidigital number, since it uses as much as digits as its factorization.

21428624445677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363197024562.

The product of its digits is 144506880, while the sum is 62.

The spelling of 21428624445677 in words is "twenty-one trillion, four hundred twenty-eight billion, six hundred twenty-four million, four hundred forty-five thousand, six hundred seventy-seven".