22121002220201 has 4 divisors (see below), whose sum is σ = 22269465322500. Its totient is φ = 21972539117904.

The previous prime is 22121002220101. The next prime is 22121002220209. The reversal of 22121002220201 is 10202220012122.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14422153117801 + 7698849102400 = 3797651^2 + 2774680^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22121002220201 is a prime.

It is a super-2 number, since 2×22121002220201² (a number of 27 digits) contains 22 as substring.

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 22121002220201.

It is not an unprimeable number, because it can be changed into a prime (22121002220209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74231550926 + ... + 74231551223.

It is an arithmetic number, because the mean of its divisors is an integer number (5567366330625).

Almost surely, 2^{22121002220201} is an apocalyptic number.

It is an amenable number.

22121002220201 is a deficient number, since it is larger than the sum of its proper divisors (148463102299).

22121002220201 is a wasteful number, since it uses less digits than its factorization.

22121002220201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148463102298.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 22121002220201 its reverse (10202220012122), we get a palindrome (32323222232323).

The spelling of 22121002220201 in words is "twenty-two trillion, one hundred twenty-one billion, two million, two hundred twenty thousand, two hundred one".