21875762740861 has 8 divisors (see below), whose sum is σ = 21922896096440. Its totient is φ = 21828661291008.

The previous prime is 21875762740859. The next prime is 21875762740879. The reversal of 21875762740861 is 16804726757812.

It can be written as a sum of positive squares in 4 ways, for example, as 14004203043961 + 7871559696900 = 3742219^2 + 2805630^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21875762740861 - 2¹ = 21875762740859 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21875762740793 and 21875762740802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21875762744861) 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, 6603426 + ... + 9346483.

It is an arithmetic number, because the mean of its divisors is an integer number (2740362012055).

Almost surely, 2^{21875762740861} is an apocalyptic number.

It is an amenable number.

21875762740861 is a deficient number, since it is larger than the sum of its proper divisors (47133355579).

21875762740861 is a wasteful number, since it uses less digits than its factorization.

21875762740861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15952863.

The product of its (nonzero) digits is 63221760, while the sum is 64.

The spelling of 21875762740861 in words is "twenty-one trillion, eight hundred seventy-five billion, seven hundred sixty-two million, seven hundred forty thousand, eight hundred sixty-one".