21961980593281 has 16 divisors (see below), whose sum is σ = 22930770094848. Its totient is φ = 20994355166400.

The previous prime is 21961980593269. The next prime is 21961980593363. The reversal of 21961980593281 is 18239508916912.

It is a cyclic number.

It is not a de Polignac number, because 21961980593281 - 2¹³ = 21961980585089 is a prime.

It is a super-2 number, since 2×21961980593281² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21961980593981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 260198596 + ... + 260282986.

It is an arithmetic number, because the mean of its divisors is an integer number (1433173130928).

Almost surely, 2^{21961980593281} is an apocalyptic number.

It is an amenable number.

21961980593281 is a deficient number, since it is larger than the sum of its proper divisors (968789501567).

21961980593281 is a wasteful number, since it uses less digits than its factorization.

21961980593281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91152.

The product of its (nonzero) digits is 16796160, while the sum is 64.

The spelling of 21961980593281 in words is "twenty-one trillion, nine hundred sixty-one billion, nine hundred eighty million, five hundred ninety-three thousand, two hundred eighty-one".