21967012862405 has 16 divisors (see below), whose sum is σ = 28388343506544. Its totient is φ = 16221677652480.

The previous prime is 21967012862381. The next prime is 21967012862419. The reversal of 21967012862405 is 50426821076912.

It is a Cunningham number, because it is equal to 4686898²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 6669895072996 + 15297117789409 = 2582614^2 + 3911153^2 .

It is not a de Polignac number, because 21967012862405 - 2⁶ = 21967012862341 is a prime.

It is a super-2 number, since 2×21967012862405² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8504507 + ... + 10782423.

It is an arithmetic number, because the mean of its divisors is an integer number (1774271469159).

Almost surely, 2^{21967012862405} is an apocalyptic number.

It is an amenable number.

21967012862405 is a deficient number, since it is larger than the sum of its proper divisors (6421330644139).

21967012862405 is a wasteful number, since it uses less digits than its factorization.

21967012862405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2426296.

The product of its (nonzero) digits is 2903040, while the sum is 53.

The spelling of 21967012862405 in words is "twenty-one trillion, nine hundred sixty-seven billion, twelve million, eight hundred sixty-two thousand, four hundred five".