22121012100221 has 8 divisors (see below), whose sum is σ = 22834872223488. Its totient is φ = 21407169420000.

The previous prime is 22121012100217. The next prime is 22121012100259. The reversal of 22121012100221 is 12200121012122.

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 22121012100221 - 2² = 22121012100217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22121012100221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121012100721) 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, 1758815 + ... + 6880076.

It is an arithmetic number, because the mean of its divisors is an integer number (2854359027936).

Almost surely, 2^{22121012100221} is an apocalyptic number.

It is an amenable number.

22121012100221 is a deficient number, since it is larger than the sum of its proper divisors (713860123267).

22121012100221 is an equidigital number, since it uses as much as digits as its factorization.

22121012100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8721523.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 22121012100221 its reverse (12200121012122), we get a palindrome (34321133112343).

The spelling of 22121012100221 in words is "twenty-two trillion, one hundred twenty-one billion, twelve million, one hundred thousand, two hundred twenty-one".