20100221120221 has 8 divisors (see below), whose sum is σ = 21927548373984. Its totient is φ = 18272899603920.

The previous prime is 20100221120207. The next prime is 20100221120293. The reversal of 20100221120221 is 12202112200102.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20100221120221 - 2⁹ = 20100221119709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20100221120195 and 20100221120204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20100221120201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9544426 + ... + 11458468.

It is an arithmetic number, because the mean of its divisors is an integer number (2740943546748).

Almost surely, 2^{20100221120221} is an apocalyptic number.

It is an amenable number.

20100221120221 is a deficient number, since it is larger than the sum of its proper divisors (1827327253763).

20100221120221 is a wasteful number, since it uses less digits than its factorization.

20100221120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2868731.

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

Adding to 20100221120221 its reverse (12202112200102), we get a palindrome (32302333320323).

The spelling of 20100221120221 in words is "twenty trillion, one hundred billion, two hundred twenty-one million, one hundred twenty thousand, two hundred twenty-one".