21002220011208 has 32 divisors (see below), whose sum is σ = 52772075674560. Its totient is φ = 6965203250880.

The previous prime is 21002220011189. The next prime is 21002220011341. The reversal of 21002220011208 is 80211002220012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2221042228 + ... + 2221051683.

It is an arithmetic number, because the mean of its divisors is an integer number (1649127364830).

Almost surely, 2^{21002220011208} is an apocalyptic number.

It is an amenable number.

21002220011208 is an abundant number, since it is smaller than the sum of its proper divisors (31769855663352).

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

21002220011208 is a wasteful number, since it uses less digits than its factorization.

21002220011208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4442094117 (or 4442094113 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

The spelling of 21002220011208 in words is "twenty-one trillion, two billion, two hundred twenty million, eleven thousand, two hundred eight".