21221200100202 has 128 divisors (see below), whose sum is σ = 44605384212480. Its totient is φ = 6722724625920.

The previous prime is 21221200100201. The next prime is 21221200100237. The reversal of 21221200100202 is 20200100212212.

It is a super-3 number, since 3×21221200100202³ (a number of 41 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21221200100201) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2654969118 + ... + 2654977110.

It is an arithmetic number, because the mean of its divisors is an integer number (348479564160).

Almost surely, 2^{21221200100202} is an apocalyptic number.

21221200100202 is an abundant number, since it is smaller than the sum of its proper divisors (23384184112278).

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

21221200100202 is a wasteful number, since it uses less digits than its factorization.

21221200100202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9268.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21221200100202 its reverse (20200100212212), we get a palindrome (41421300312414).

The spelling of 21221200100202 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred million, one hundred thousand, two hundred two".