21122202221121 has 16 divisors (see below), whose sum is σ = 28174857611264. Its totient is φ = 14075507983824.

The previous prime is 21122202221119. The next prime is 21122202221147. The reversal of 21122202221121 is 12112220222112.

It is not a de Polignac number, because 21122202221121 - 2¹ = 21122202221119 is a prime.

It is a super-2 number, since 2×21122202221121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21122202221111) 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, 229186776 + ... + 229278918.

It is an arithmetic number, because the mean of its divisors is an integer number (1760928600704).

Almost surely, 2^{21122202221121} is an apocalyptic number.

It is an amenable number.

21122202221121 is a deficient number, since it is larger than the sum of its proper divisors (7052655390143).

21122202221121 is a wasteful number, since it uses less digits than its factorization.

21122202221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123660.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 21122202221121 its reverse (12112220222112), we get a palindrome (33234422443233).

The spelling of 21122202221121 in words is "twenty-one trillion, one hundred twenty-two billion, two hundred two million, two hundred twenty-one thousand, one hundred twenty-one".