21155161076676 has 243 divisors, whose sum is σ = 59231920412847. Its totient is φ = 6361624478880.

The previous prime is 21155161076591. The next prime is 21155161076683. The reversal of 21155161076676 is 67667016155112.

The square root of 21155161076676 is 4599474.

It is a perfect power (a square), and thus also a powerful number.

21155161076676 is a `hidden beast` number, since 2 + 1 + 1 + 551 + 6 + 10 + 7 + 6 + 6 + 76 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 68909319315 + ... + 68909319621.

Almost surely, 2^{21155161076676} is an apocalyptic number.

21155161076676 is the 4599474-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21155161076676

21155161076676 is an abundant number, since it is smaller than the sum of its proper divisors (38076759336171).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21155161076676 is a wasteful number, since it uses less digits than its factorization.

21155161076676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1100 (or 550 counting only the distinct ones).

The product of its (nonzero) digits is 3175200, while the sum is 54.

The spelling of 21155161076676 in words is "twenty-one trillion, one hundred fifty-five billion, one hundred sixty-one million, seventy-six thousand, six hundred seventy-six".