21357172182743 has 4 divisors (see below), whose sum is σ = 22046113220928. Its totient is φ = 20668231144560.

The previous prime is 21357172182727. The next prime is 21357172182757. The reversal of 21357172182743 is 34728127175312.

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

It is a cyclic number.

It is not a de Polignac number, because 21357172182743 - 2⁴ = 21357172182727 is a prime.

It is a super-2 number, since 2×21357172182743² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21357172182043) 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, 344470519046 + ... + 344470519107.

It is an arithmetic number, because the mean of its divisors is an integer number (5511528305232).

Almost surely, 2^{21357172182743} is an apocalyptic number.

21357172182743 is a deficient number, since it is larger than the sum of its proper divisors (688941038185).

21357172182743 is an equidigital number, since it uses as much as digits as its factorization.

21357172182743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 688941038184.

The product of its digits is 3951360, while the sum is 53.

The spelling of 21357172182743 in words is "twenty-one trillion, three hundred fifty-seven billion, one hundred seventy-two million, one hundred eighty-two thousand, seven hundred forty-three".