201222221100021 has 24 divisors (see below), whose sum is σ = 317090067244704. Its totient is φ = 121948004374560.

The previous prime is 201222221099971. The next prime is 201222221100023. The reversal of 201222221100021 is 120001122222102.

It is a happy number.

201222221100021 is a `hidden beast` number, since 201 + 222 + 221 + 1 + 0 + 0 + 0 + 21 = 666.

201222221100021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 201222221100021 - 2²⁷ = 201222086882293 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201222221099967 and 201222221100003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201222221100023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37975011 + ... + 42948176.

It is an arithmetic number, because the mean of its divisors is an integer number (13212086135196).

Almost surely, 2^{201222221100021} is an apocalyptic number.

It is an amenable number.

201222221100021 is a deficient number, since it is larger than the sum of its proper divisors (115867846144683).

201222221100021 is a wasteful number, since it uses less digits than its factorization.

201222221100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80948321 (or 80948318 counting only the distinct ones).

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

Adding to 201222221100021 its reverse (120001122222102), we get a palindrome (321223343322123).

The spelling of 201222221100021 in words is "two hundred one trillion, two hundred twenty-two billion, two hundred twenty-one million, one hundred thousand, twenty-one".