21656424145371 has 8 divisors (see below), whose sum is σ = 28875270784080. Its totient is φ = 14437596801792.

The previous prime is 21656424145289. The next prime is 21656424145393. The reversal of 21656424145371 is 17354142465612.

It is a happy number.

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

It is not a de Polignac number, because 21656424145371 - 2¹⁹ = 21656423621083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21656424145171) 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, 1962430 + ... + 6867603.

It is an arithmetic number, because the mean of its divisors is an integer number (3609408848010).

Almost surely, 2^{21656424145371} is an apocalyptic number.

21656424145371 is a deficient number, since it is larger than the sum of its proper divisors (7218846638709).

21656424145371 is an equidigital number, since it uses as much as digits as its factorization.

21656424145371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9647565.

The product of its digits is 4838400, while the sum is 51.

The spelling of 21656424145371 in words is "twenty-one trillion, six hundred fifty-six billion, four hundred twenty-four million, one hundred forty-five thousand, three hundred seventy-one".