21002000221000 has 32 divisors (see below), whose sum is σ = 49144680519480. Its totient is φ = 8400800088000.

The previous prime is 21002000220991. The next prime is 21002000221031. The reversal of 21002000221000 is 12200020012.

It can be written as a sum of positive squares in 4 ways, for example, as 2492060047876 + 18509940173124 = 1578626^2 + 4302318^2 .

It is a super-3 number, since 3×21002000221000³ (a number of 41 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10500999111 + ... + 10501001110.

Almost surely, 2^{21002000221000} is an apocalyptic number.

21002000221000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21002000221000 is an abundant number, since it is smaller than the sum of its proper divisors (28142680298480).

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

21002000221000 is a wasteful number, since it uses less digits than its factorization.

21002000221000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21002000242 (or 21002000228 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 21002000221000 its reverse (12200020012), we get a palindrome (21014200241012).

The spelling of 21002000221000 in words is "twenty-one trillion, two billion, two hundred twenty-one thousand".