21056051071 has 12 divisors (see below), whose sum is σ = 23299605000. Its totient is φ = 19013379440.

The previous prime is 21056051041. The next prime is 21056051119. The reversal of 21056051071 is 17015065012.

It is not a de Polignac number, because 21056051071 - 2¹⁷ = 21055919999 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 (21056051041) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 565921 + ... + 601978.

It is an arithmetic number, because the mean of its divisors is an integer number (1941633750).

Almost surely, 2^21056051071 is an apocalyptic number.

21056051071 is a deficient number, since it is larger than the sum of its proper divisors (2243553929).

21056051071 is a wasteful number, since it uses less digits than its factorization.

21056051071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1168070 (or 1168059 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 28.

The spelling of 21056051071 in words is "twenty-one billion, fifty-six million, fifty-one thousand, seventy-one".