2201222121021 has 72 divisors (see below), whose sum is σ = 4184333977824. Its totient is φ = 1143491942880.

The previous prime is 2201222120963. The next prime is 2201222121061. The reversal of 2201222121021 is 1201212221022.

It is a happy number.

2201222121021 is a `hidden beast` number, since 220 + 12 + 221 + 210 + 2 + 1 = 666.

It is not a de Polignac number, because 2201222121021 - 2¹⁰ = 2201222119997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2201222120985 and 2201222121003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2201222121061) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 8272110 + ... + 8534063.

It is an arithmetic number, because the mean of its divisors is an integer number (58115749692).

Almost surely, 2^{2201222121021} is an apocalyptic number.

2201222121021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2201222121021 is a deficient number, since it is larger than the sum of its proper divisors (1983111856803).

2201222121021 is a wasteful number, since it uses less digits than its factorization.

2201222121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16806213 (or 16806194 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 2201222121021 its reverse (1201212221022), we get a palindrome (3402434342043).

The spelling of 2201222121021 in words is "two trillion, two hundred one billion, two hundred twenty-two million, one hundred twenty-one thousand, twenty-one".