821892051 has 12 divisors (see below), whose sum is σ = 1238794128. Its totient is φ = 524104944.

The previous prime is 821892011. The next prime is 821892079. The reversal of 821892051 is 150298128.

It is a de Polignac number, because none of the positive numbers 2^k-821892051 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 821891997 and 821892015.

It is not an unprimeable number, because it can be changed into a prime (821892011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1985040 + ... + 1985453.

It is an arithmetic number, because the mean of its divisors is an integer number (103232844).

Almost surely, 2^821892051 is an apocalyptic number.

821892051 is a deficient number, since it is larger than the sum of its proper divisors (416902077).

821892051 is a wasteful number, since it uses less digits than its factorization.

821892051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3970522 (or 3970519 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The square root of 821892051 is about 28668.6597349789. The cubic root of 821892051 is about 936.7095040980.

The spelling of 821892051 in words is "eight hundred twenty-one million, eight hundred ninety-two thousand, fifty-one".