21202200101221 has 16 divisors (see below), whose sum is σ = 21506283348544. Its totient is φ = 20898490230144.

The previous prime is 21202200101189. The next prime is 21202200101273. The reversal of 21202200101221 is 12210100220212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21202200101221 - 2⁵ = 21202200101189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21202200101195 and 21202200101204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202200101521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 825200251 + ... + 825225943.

It is an arithmetic number, because the mean of its divisors is an integer number (1344142709284).

Almost surely, 2^{21202200101221} is an apocalyptic number.

It is an amenable number.

21202200101221 is a deficient number, since it is larger than the sum of its proper divisors (304083247323).

21202200101221 is a wasteful number, since it uses less digits than its factorization.

21202200101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32500.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21202200101221 its reverse (12210100220212), we get a palindrome (33412300321433).

The spelling of 21202200101221 in words is "twenty-one trillion, two hundred two billion, two hundred million, one hundred one thousand, two hundred twenty-one".