821711051 has 8 divisors (see below), whose sum is σ = 939456480. Its totient is φ = 704055168.

The previous prime is 821711003. The next prime is 821711057. The reversal of 821711051 is 150117128.

821711051 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 821711051 - 2²⁶ = 754602187 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 821711051.

It is not an unprimeable number, because it can be changed into a prime (821711057) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1406 + ... + 40563.

It is an arithmetic number, because the mean of its divisors is an integer number (117432060).

Almost surely, 2^821711051 is an apocalyptic number.

821711051 is a deficient number, since it is larger than the sum of its proper divisors (117745429).

821711051 is a wasteful number, since it uses less digits than its factorization.

821711051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44773.

The product of its (nonzero) digits is 560, while the sum is 26.

The square root of 821711051 is about 28665.5028038930. The cubic root of 821711051 is about 936.6407372133.

Adding to 821711051 its reverse (150117128), we get a palindrome (971828179).

The spelling of 821711051 in words is "eight hundred twenty-one million, seven hundred eleven thousand, fifty-one".