22021220021121 has 20 divisors (see below), whose sum is σ = 34627259554800. Its totient is φ = 13908138959736.

The previous prime is 22021220021033. The next prime is 22021220021131. The reversal of 22021220021121 is 12112002212022.

It is a happy number.

22021220021121 is a `hidden beast` number, since 2 + 20 + 212 + 200 + 211 + 21 = 666.

It is not a de Polignac number, because 22021220021121 - 2¹⁰ = 22021220020097 is a prime.

It is a super-4 number, since 4×22021220021121⁴ (a number of 54 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 22021220021094 and 22021220021103.

It is not an unprimeable number, because it can be changed into a prime (22021220021131) 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 19 ways as a sum of consecutive naturals, for example, 7154390931 + ... + 7154394008.

It is an arithmetic number, because the mean of its divisors is an integer number (1731362977740).

Almost surely, 2^{22021220021121} is an apocalyptic number.

It is an amenable number.

22021220021121 is a deficient number, since it is larger than the sum of its proper divisors (12606039533679).

22021220021121 is a wasteful number, since it uses less digits than its factorization.

22021220021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14308784970 (or 14308784961 counting only the distinct ones).

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

Adding to 22021220021121 its reverse (12112002212022), we get a palindrome (34133222233143).

The spelling of 22021220021121 in words is "twenty-two trillion, twenty-one billion, two hundred twenty million, twenty-one thousand, one hundred twenty-one".