21275434979461 has 8 divisors (see below), whose sum is σ = 22912281809144. Its totient is φ = 19638627422400.

The previous prime is 21275434979453. The next prime is 21275434979489. The reversal of 21275434979461 is 16497943457212.

It can be written as a sum of positive squares in 4 ways, for example, as 189567935236 + 21085867044225 = 435394^2 + 4591935^2 .

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 21275434979461 - 2³ = 21275434979453 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21275434979393 and 21275434979402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21275434979431) 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, 8688186 + ... + 10864411.

It is an arithmetic number, because the mean of its divisors is an integer number (2864035226143).

Almost surely, 2^{21275434979461} is an apocalyptic number.

It is an amenable number.

21275434979461 is a deficient number, since it is larger than the sum of its proper divisors (1636846829683).

21275434979461 is a wasteful number, since it uses less digits than its factorization.

21275434979461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19636311.

The product of its digits is 91445760, while the sum is 64.

The spelling of 21275434979461 in words is "twenty-one trillion, two hundred seventy-five billion, four hundred thirty-four million, nine hundred seventy-nine thousand, four hundred sixty-one".