20101202100221 has 4 divisors (see below), whose sum is σ = 21928584109344. Its totient is φ = 18273820091100.

The previous prime is 20101202100173. The next prime is 20101202100233. The reversal of 20101202100221 is 12200120210102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20101202100221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20101202100196 and 20101202100205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101202100251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 913691004545 + ... + 913691004566.

It is an arithmetic number, because the mean of its divisors is an integer number (5482146027336).

Almost surely, 2^{20101202100221} is an apocalyptic number.

It is an amenable number.

20101202100221 is a deficient number, since it is larger than the sum of its proper divisors (1827382009123).

20101202100221 is a wasteful number, since it uses less digits than its factorization.

20101202100221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1827382009122.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20101202100221 its reverse (12200120210102), we get a palindrome (32301322310323).

The spelling of 20101202100221 in words is "twenty trillion, one hundred one billion, two hundred two million, one hundred thousand, two hundred twenty-one".