21221000220010 has 16 divisors (see below), whose sum is σ = 38228383125000. Its totient is φ = 8481603926016.

The previous prime is 21221000219957. The next prime is 21221000220059. The reversal of 21221000220010 is 1002200012212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 13413664526089 + 7807335693921 = 3662467^2 + 2794161^2 .

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, 849507135 + ... + 849532114.

Almost surely, 2^{21221000220010} is an apocalyptic number.

21221000220010 is a deficient number, since it is larger than the sum of its proper divisors (17007382904990).

21221000220010 is a wasteful number, since it uses less digits than its factorization.

21221000220010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1699040505.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21221000220010 its reverse (1002200012212), we get a palindrome (22223200232222).

The spelling of 21221000220010 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred twenty thousand, ten".