21112020222121 has 12 divisors (see below), whose sum is σ = 22963181005200. Its totient is φ = 19355672173320.

The previous prime is 21112020222113. The next prime is 21112020222179. The reversal of 21112020222121 is 12122202021112.

It is not a de Polignac number, because 21112020222121 - 2³ = 21112020222113 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21112020220121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 578108151 + ... + 578144668.

It is an arithmetic number, because the mean of its divisors is an integer number (1913598417100).

Almost surely, 2^{21112020222121} is an apocalyptic number.

It is an amenable number.

21112020222121 is a deficient number, since it is larger than the sum of its proper divisors (1851160783079).

21112020222121 is a wasteful number, since it uses less digits than its factorization.

21112020222121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1156252900 (or 1156252869 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21112020222121 its reverse (12122202021112), we get a palindrome (33234222243233).

The spelling of 21112020222121 in words is "twenty-one trillion, one hundred twelve billion, twenty million, two hundred twenty-two thousand, one hundred twenty-one".