221010001000 has 32 divisors (see below), whose sum is σ = 517163404680. Its totient is φ = 88404000000.

The previous prime is 221010000943. The next prime is 221010001019. The reversal of 221010001000 is 100010122.

It can be written as a sum of positive squares in 4 ways, for example, as 75066136324 + 145943864676 = 273982^2 + 382026^2 .

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, 110504001 + ... + 110506000.

Almost surely, 2^221010001000 is an apocalyptic number.

221010001000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221010001000 is an abundant number, since it is smaller than the sum of its proper divisors (296153403680).

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

221010001000 is a wasteful number, since it uses less digits than its factorization.

221010001000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221010022 (or 221010008 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 221010001000 its reverse (100010122), we get a palindrome (221110011122).

The spelling of 221010001000 in words is "two hundred twenty-one billion, ten million, one thousand".