22001020121 has 4 divisors (see below), whose sum is σ = 22361692644. Its totient is φ = 21640347600.

The previous prime is 22001020103. The next prime is 22001020123. The reversal of 22001020121 is 12102010022.

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 6758648521 + 15242371600 = 82211^2 + 123460^2 .

It is a cyclic number.

It is not a de Polignac number, because 22001020121 - 2¹⁰ = 22001019097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22001020123) 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, 180336170 + ... + 180336291.

It is an arithmetic number, because the mean of its divisors is an integer number (5590423161).

Almost surely, 2^22001020121 is an apocalyptic number.

It is an amenable number.

22001020121 is a deficient number, since it is larger than the sum of its proper divisors (360672523).

22001020121 is an equidigital number, since it uses as much as digits as its factorization.

22001020121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360672522.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 22001020121 its reverse (12102010022), we get a palindrome (34103030143).

The spelling of 22001020121 in words is "twenty-two billion, one million, twenty thousand, one hundred twenty-one".