21221001100210 has 8 divisors (see below), whose sum is σ = 38197801980396. Its totient is φ = 8488400440080.

The previous prime is 21221001100151. The next prime is 21221001100213. The reversal of 21221001100210 is 1200110012212.

It can be written as a sum of positive squares in 2 ways, for example, as 20714886952321 + 506114147889 = 4551361^2 + 711417^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21221001100210² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21221001100213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1061050055001 + ... + 1061050055020.

Almost surely, 2^{21221001100210} is an apocalyptic number.

21221001100210 is a deficient number, since it is larger than the sum of its proper divisors (16976800880186).

21221001100210 is a wasteful number, since it uses less digits than its factorization.

21221001100210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2122100110028.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21221001100210 its reverse (1200110012212), we get a palindrome (22421111112422).

The spelling of 21221001100210 in words is "twenty-one trillion, two hundred twenty-one billion, one million, one hundred thousand, two hundred ten".