21344171451 has 8 divisors (see below), whose sum is σ = 28464289104. Its totient is φ = 14226750720.

The previous prime is 21344171437. The next prime is 21344171467. The reversal of 21344171451 is 15417144312.

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 21344171451 - 2⁷ = 21344171323 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21344171951) 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, 655690 + ... + 687471.

It is an arithmetic number, because the mean of its divisors is an integer number (3558036138).

Almost surely, 2^21344171451 is an apocalyptic number.

21344171451 is a deficient number, since it is larger than the sum of its proper divisors (7120117653).

21344171451 is a wasteful number, since it uses less digits than its factorization.

21344171451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1348461.

The product of its digits is 13440, while the sum is 33.

The spelling of 21344171451 in words is "twenty-one billion, three hundred forty-four million, one hundred seventy-one thousand, four hundred fifty-one".