821649262042 has 8 divisors (see below), whose sum is σ = 1408541592096. Its totient is φ = 352135398012.

The previous prime is 821649261997. The next prime is 821649262043. The reversal of 821649262042 is 240262946128.

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

It is a junction number, because it is equal to n+sod(n) for n = 821649261983 and 821649262001.

It is not an unprimeable number, because it can be changed into a prime (821649262043) 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, 29344616488 + ... + 29344616515.

It is an arithmetic number, because the mean of its divisors is an integer number (176067699012).

Almost surely, 2^821649262042 is an apocalyptic number.

821649262042 is a deficient number, since it is larger than the sum of its proper divisors (586892330054).

821649262042 is a wasteful number, since it uses less digits than its factorization.

821649262042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58689233012.

The product of its (nonzero) digits is 663552, while the sum is 46.

The spelling of 821649262042 in words is "eight hundred twenty-one billion, six hundred forty-nine million, two hundred sixty-two thousand, forty-two".