21424804621643 has 8 divisors (see below), whose sum is σ = 21428570322768. Its totient is φ = 21421039165344.

The previous prime is 21424804621607. The next prime is 21424804621667. The reversal of 21424804621643 is 34612640842412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21424804621643 - 2²⁶ = 21424737512779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21424804623643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 277244096 + ... + 277321362.

It is an arithmetic number, because the mean of its divisors is an integer number (2678571290346).

Almost surely, 2^{21424804621643} is an apocalyptic number.

21424804621643 is a deficient number, since it is larger than the sum of its proper divisors (3765701125).

21424804621643 is an equidigital number, since it uses as much as digits as its factorization.

21424804621643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122413.

The product of its (nonzero) digits is 1769472, while the sum is 47.

The spelling of 21424804621643 in words is "twenty-one trillion, four hundred twenty-four billion, eight hundred four million, six hundred twenty-one thousand, six hundred forty-three".