21375171311274 has 48 divisors (see below), whose sum is σ = 50524438517280. Its totient is φ = 6477157162080.

The previous prime is 21375171311243. The next prime is 21375171311297. The reversal of 21375171311274 is 47211317157312.

It is a happy number.

21375171311274 is a `hidden beast` number, since 2 + 1 + 3 + 7 + 517 + 1 + 3 + 1 + 127 + 4 = 666.

It is a super-2 number, since 2×21375171311274² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6390912 + ... + 9142980.

It is an arithmetic number, because the mean of its divisors is an integer number (1052592469110).

Almost surely, 2^{21375171311274} is an apocalyptic number.

21375171311274 is an abundant number, since it is smaller than the sum of its proper divisors (29149267206006).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21375171311274 is a wasteful number, since it uses less digits than its factorization.

21375171311274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2791315 (or 2791312 counting only the distinct ones).

The product of its digits is 246960, while the sum is 45.

Adding to 21375171311274 its reverse (47211317157312), we get a palindrome (68586488468586).

The spelling of 21375171311274 in words is "twenty-one trillion, three hundred seventy-five billion, one hundred seventy-one million, three hundred eleven thousand, two hundred seventy-four".