21511266751071 has 16 divisors (see below), whose sum is σ = 31942142759520. Its totient is φ = 14307724759680.

The previous prime is 21511266751033. The next prime is 21511266751109. The reversal of 21511266751071 is 17015766211512.

21511266751071 is a `hidden beast` number, since 2 + 1 + 5 + 1 + 1 + 2 + 6 + 67 + 510 + 71 = 666.

It is an interprime number because it is at equal distance from previous prime (21511266751033) and next prime (21511266751109).

It is not a de Polignac number, because 21511266751071 - 2³⁹ = 20961510937183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21511266851071) 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, 919980900 + ... + 920004281.

It is an arithmetic number, because the mean of its divisors is an integer number (1996383922470).

Almost surely, 2^{21511266751071} is an apocalyptic number.

21511266751071 is a deficient number, since it is larger than the sum of its proper divisors (10430876008449).

21511266751071 is a wasteful number, since it uses less digits than its factorization.

21511266751071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1839985623 (or 1839985617 counting only the distinct ones).

The product of its (nonzero) digits is 176400, while the sum is 45.

The spelling of 21511266751071 in words is "twenty-one trillion, five hundred eleven billion, two hundred sixty-six million, seven hundred fifty-one thousand, seventy-one".