20212222222121 has 16 divisors (see below), whose sum is σ = 21098712729600. Its totient is φ = 19326374707200.

The previous prime is 20212222222079. The next prime is 20212222222139. The reversal of 20212222222121 is 12122222221202.

It is a cyclic number.

It is not a de Polignac number, because 20212222222121 - 2⁶ = 20212222222057 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20212222222421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1059720041 + ... + 1059739113.

It is an arithmetic number, because the mean of its divisors is an integer number (1318669545600).

Almost surely, 2^{20212222222121} is an apocalyptic number.

It is an amenable number.

20212222222121 is a deficient number, since it is larger than the sum of its proper divisors (886490507479).

20212222222121 is a wasteful number, since it uses less digits than its factorization.

20212222222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33496.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 20212222222121 its reverse (12122222221202), we get a palindrome (32334444443323).

The spelling of 20212222222121 in words is "twenty trillion, two hundred twelve billion, two hundred twenty-two million, two hundred twenty-two thousand, one hundred twenty-one".