21020122011222 has 72 divisors (see below), whose sum is σ = 50483711403216. Its totient is φ = 6307828564224.

The previous prime is 21020122011221. The next prime is 21020122011283. The reversal of 21020122011222 is 22211022102012.

It is a happy number.

21020122011222 is a `hidden beast` number, since 2 + 10 + 201 + 220 + 11 + 222 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21020122011195 and 21020122011204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020122011221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 87723333 + ... + 87962624.

It is an arithmetic number, because the mean of its divisors is an integer number (701162658378).

Almost surely, 2^{21020122011222} is an apocalyptic number.

21020122011222 is an abundant number, since it is smaller than the sum of its proper divisors (29463589391994).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21020122011222 is a wasteful number, since it uses less digits than its factorization.

21020122011222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175686022 (or 175686002 counting only the distinct ones).

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

Adding to 21020122011222 its reverse (22211022102012), we get a palindrome (43231144113234).

The spelling of 21020122011222 in words is "twenty-one trillion, twenty billion, one hundred twenty-two million, eleven thousand, two hundred twenty-two".