821677115011 has 4 divisors (see below), whose sum is σ = 857402206992. Its totient is φ = 785952023032.

The previous prime is 821677115003. The next prime is 821677115027. The reversal of 821677115011 is 110511776128.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 821677115011 - 2³ = 821677115003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (821677115911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17862545956 + ... + 17862546001.

It is an arithmetic number, because the mean of its divisors is an integer number (214350551748).

Almost surely, 2^821677115011 is an apocalyptic number.

821677115011 is a deficient number, since it is larger than the sum of its proper divisors (35725091981).

821677115011 is a wasteful number, since it uses less digits than its factorization.

821677115011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35725091980.

The product of its (nonzero) digits is 23520, while the sum is 40.

The spelling of 821677115011 in words is "eight hundred twenty-one billion, six hundred seventy-seven million, one hundred fifteen thousand, eleven".