21000672052071 has 16 divisors (see below), whose sum is σ = 28040752794624. Its totient is φ = 13980531471264.

The previous prime is 21000672052051. The next prime is 21000672052111. The reversal of 21000672052071 is 17025027600012.

It is not a de Polignac number, because 21000672052071 - 2⁷ = 21000672051943 is a prime.

It is a super-3 number, since 3×21000672052071³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000672052051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5654350 + ... + 8600756.

It is an arithmetic number, because the mean of its divisors is an integer number (1752547049664).

Almost surely, 2^{21000672052071} is an apocalyptic number.

21000672052071 is a deficient number, since it is larger than the sum of its proper divisors (7040080742553).

21000672052071 is a wasteful number, since it uses less digits than its factorization.

21000672052071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2949790.

The product of its (nonzero) digits is 11760, while the sum is 33.

Adding to 21000672052071 its reverse (17025027600012), we get a palindrome (38025699652083).

The spelling of 21000672052071 in words is "twenty-one trillion, six hundred seventy-two million, fifty-two thousand, seventy-one".