821220019608 has 16 divisors (see below), whose sum is σ = 2053050049080. Its totient is φ = 273740006528.

The previous prime is 821220019601. The next prime is 821220019621. The reversal of 821220019608 is 806910022128.

821220019608 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821220019601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17108750385 + ... + 17108750432.

Almost surely, 2^821220019608 is an apocalyptic number.

It is an amenable number.

821220019608 is an abundant number, since it is smaller than the sum of its proper divisors (1231830029472).

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

821220019608 is a wasteful number, since it uses less digits than its factorization.

821220019608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34217500826 (or 34217500822 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 39.

The spelling of 821220019608 in words is "eight hundred twenty-one billion, two hundred twenty million, nineteen thousand, six hundred eight".