208507821000 has 128 divisors (see below), whose sum is σ = 661209644160. Its totient is φ = 54690528000.

The previous prime is 208507820951. The next prime is 208507821007. The reversal of 208507821000 is 128705802.

It is a super-2 number, since 2×208507821000² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (208507821007) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 386694 + ... + 752693.

It is an arithmetic number, because the mean of its divisors is an integer number (5165700345).

Almost surely, 2^208507821000 is an apocalyptic number.

208507821000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

208507821000 is an abundant number, since it is smaller than the sum of its proper divisors (452701823160).

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

208507821000 is a wasteful number, since it uses less digits than its factorization.

208507821000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1139472 (or 1139458 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 33.

The spelling of 208507821000 in words is "two hundred eight billion, five hundred seven million, eight hundred twenty-one thousand".