22001200212121 has 8 divisors (see below), whose sum is σ = 23700591600840. Its totient is φ = 20302807590912.

The previous prime is 22001200212077. The next prime is 22001200212139. The reversal of 22001200212121 is 12121200210022.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 12220694547721 + 9780505664400 = 3495811^2 + 3127380^2 .

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 22001200212121 - 2⁷ = 22001200211993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22001200212095 and 22001200212104.

It is not an unprimeable number, because it can be changed into a prime (22001200212421) 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, 249646120 + ... + 249734233.

It is an arithmetic number, because the mean of its divisors is an integer number (2962573950105).

Almost surely, 2^{22001200212121} is an apocalyptic number.

It is an amenable number.

22001200212121 is a deficient number, since it is larger than the sum of its proper divisors (1699391388719).

22001200212121 is a wasteful number, since it uses less digits than its factorization.

22001200212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499383755.

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

Adding to 22001200212121 its reverse (12121200210022), we get a palindrome (34122400422143).

The spelling of 22001200212121 in words is "twenty-two trillion, one billion, two hundred million, two hundred twelve thousand, one hundred twenty-one".