21265092481 has 8 divisors (see below), whose sum is σ = 22533552864. Its totient is φ = 19998584640.

The previous prime is 21265092469. The next prime is 21265092491. The reversal of 21265092481 is 18429056212.

It is a happy number.

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 21265092481 - 2⁵ = 21265092449 is a prime.

It is a super-2 number, since 2×21265092481² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21265092491) 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, 465675 + ... + 509296.

It is an arithmetic number, because the mean of its divisors is an integer number (2816694108).

Almost surely, 2^21265092481 is an apocalyptic number.

It is an amenable number.

21265092481 is a deficient number, since it is larger than the sum of its proper divisors (1268460383).

21265092481 is a wasteful number, since it uses less digits than its factorization.

21265092481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 976271.

The product of its (nonzero) digits is 69120, while the sum is 40.

The spelling of 21265092481 in words is "twenty-one billion, two hundred sixty-five million, ninety-two thousand, four hundred eighty-one".