21959341477 has 8 divisors (see below), whose sum is σ = 22043621912. Its totient is φ = 21875097600.

The previous prime is 21959341451. The next prime is 21959341493. The reversal of 21959341477 is 77414395912.

It can be written as a sum of positive squares in 4 ways, for example, as 2553179841 + 19406161636 = 50529^2 + 139306^2 .

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 21959341477 - 2¹⁹ = 21958817189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21959341427) 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, 2122477 + ... + 2132797.

It is an arithmetic number, because the mean of its divisors is an integer number (2755452739).

Almost surely, 2^21959341477 is an apocalyptic number.

It is an amenable number.

21959341477 is a deficient number, since it is larger than the sum of its proper divisors (84280435).

21959341477 is a wasteful number, since it uses less digits than its factorization.

21959341477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18279.

The product of its digits is 1905120, while the sum is 52.

The spelling of 21959341477 in words is "twenty-one billion, nine hundred fifty-nine million, three hundred forty-one thousand, four hundred seventy-seven".