21212202112201 has 16 divisors (see below), whose sum is σ = 21839688823680. Its totient is φ = 20595456685440.

The previous prime is 21212202112141. The next prime is 21212202112217. The reversal of 21212202112201 is 10221120221212.

It is a cyclic number.

It is not a de Polignac number, because 21212202112201 - 2⁹ = 21212202111689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21212202112001) 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, 3905586 + ... + 7594603.

It is an arithmetic number, because the mean of its divisors is an integer number (1364980551480).

Almost surely, 2^{21212202112201} is an apocalyptic number.

It is an amenable number.

21212202112201 is a deficient number, since it is larger than the sum of its proper divisors (627486711479).

21212202112201 is a wasteful number, since it uses less digits than its factorization.

21212202112201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11500656.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21212202112201 its reverse (10221120221212), we get a palindrome (31433322333413).

The spelling of 21212202112201 in words is "twenty-one trillion, two hundred twelve billion, two hundred two million, one hundred twelve thousand, two hundred one".