21967665413428 has 24 divisors (see below), whose sum is σ = 44679997454400. Its totient is φ = 9255142328448.

The previous prime is 21967665413321. The next prime is 21967665413437. The reversal of 21967665413428 is 82431456676912.

It is a super-2 number, since 2×21967665413428² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21967665413428.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6648807493 + ... + 6648810796.

It is an arithmetic number, because the mean of its divisors is an integer number (1861666560600).

Almost surely, 2^{21967665413428} is an apocalyptic number.

21967665413428 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21967665413428 is an abundant number, since it is smaller than the sum of its proper divisors (22712332040972).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21967665413428 is a wasteful number, since it uses less digits than its factorization.

21967665413428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13297618359 (or 13297618357 counting only the distinct ones).

The product of its digits is 104509440, while the sum is 64.

The spelling of 21967665413428 in words is "twenty-one trillion, nine hundred sixty-seven billion, six hundred sixty-five million, four hundred thirteen thousand, four hundred twenty-eight".