21211010002221 has 16 divisors (see below), whose sum is σ = 30726364393536. Its totient is φ = 12937416581376.

The previous prime is 21211010002207. The next prime is 21211010002277. The reversal of 21211010002221 is 12220001011212.

It is not a de Polignac number, because 21211010002221 - 2⁷ = 21211010002093 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21211010002221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211010002201) 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, 2406509095 + ... + 2406517908.

It is an arithmetic number, because the mean of its divisors is an integer number (1920397774596).

Almost surely, 2^{21211010002221} is an apocalyptic number.

It is an amenable number.

21211010002221 is a deficient number, since it is larger than the sum of its proper divisors (9515354391315).

21211010002221 is a wasteful number, since it uses less digits than its factorization.

21211010002221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4813027132.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21211010002221 its reverse (12220001011212), we get a palindrome (33431011013433).

The spelling of 21211010002221 in words is "twenty-one trillion, two hundred eleven billion, ten million, two thousand, two hundred twenty-one".