21452577317894 has 4 divisors (see below), whose sum is σ = 32178865976844. Its totient is φ = 10726288658946.

The previous prime is 21452577317893. The next prime is 21452577317917. The reversal of 21452577317894 is 49871377525412.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21452577317894.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21452577317893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5363144329472 + ... + 5363144329475.

It is an arithmetic number, because the mean of its divisors is an integer number (8044716494211).

Almost surely, 2^{21452577317894} is an apocalyptic number.

21452577317894 is a deficient number, since it is larger than the sum of its proper divisors (10726288658950).

21452577317894 is a wasteful number, since it uses less digits than its factorization.

21452577317894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10726288658949.

The product of its digits is 118540800, while the sum is 65.

The spelling of 21452577317894 in words is "twenty-one trillion, four hundred fifty-two billion, five hundred seventy-seven million, three hundred seventeen thousand, eight hundred ninety-four".