21067552071 has 6 divisors (see below), whose sum is σ = 30430908560. Its totient is φ = 14045034708.

The previous prime is 21067552069. The next prime is 21067552081. The reversal of 21067552071 is 17025576012.

21067552071 is a `hidden beast` number, since 2 + 1 + 0 + 67 + 5 + 520 + 71 = 666.

It is not a de Polignac number, because 21067552071 - 2¹ = 21067552069 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 (21067552021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1170419551 + ... + 1170419568.

Almost surely, 2^21067552071 is an apocalyptic number.

21067552071 is a deficient number, since it is larger than the sum of its proper divisors (9363356489).

21067552071 is a wasteful number, since it uses less digits than its factorization.

21067552071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2340839125 (or 2340839122 counting only the distinct ones).

The product of its (nonzero) digits is 29400, while the sum is 36.

The spelling of 21067552071 in words is "twenty-one billion, sixty-seven million, five hundred fifty-two thousand, seventy-one".