21115695521151 has 48 divisors (see below), whose sum is σ = 38030384640768. Its totient is φ = 10968081696000.

The previous prime is 21115695521149. The next prime is 21115695521159. The reversal of 21115695521151 is 15112559651112.

21115695521151 is a `hidden beast` number, since 2 + 1 + 1 + 1 + 569 + 55 + 21 + 15 + 1 = 666.

It is not a de Polignac number, because 21115695521151 - 2¹ = 21115695521149 is a prime.

It is a super-3 number, since 3×21115695521151³ (a number of 41 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21115695521097 and 21115695521106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21115695521159) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5327751 + ... + 8403351.

It is an arithmetic number, because the mean of its divisors is an integer number (792299680016).

Almost surely, 2^{21115695521151} is an apocalyptic number.

21115695521151 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21115695521151 is a deficient number, since it is larger than the sum of its proper divisors (16914689119617).

21115695521151 is a wasteful number, since it uses less digits than its factorization.

21115695521151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3085532 (or 3085529 counting only the distinct ones).

The product of its digits is 135000, while the sum is 45.

The spelling of 21115695521151 in words is "twenty-one trillion, one hundred fifteen billion, six hundred ninety-five million, five hundred twenty-one thousand, one hundred fifty-one".