22211212121021 has 32 divisors (see below), whose sum is σ = 28897371426816. Its totient is φ = 16554095712000.

The previous prime is 22211212121003. The next prime is 22211212121029. The reversal of 22211212121021 is 12012121211222.

It is not a de Polignac number, because 22211212121021 - 2³⁰ = 22210138379197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22211212120984 and 22211212121002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22211212121029) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35519141 + ... + 36139061.

It is an arithmetic number, because the mean of its divisors is an integer number (903042857088).

Almost surely, 2^{22211212121021} is an apocalyptic number.

It is an amenable number.

22211212121021 is a deficient number, since it is larger than the sum of its proper divisors (6686159305795).

22211212121021 is a wasteful number, since it uses less digits than its factorization.

22211212121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640193.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 22211212121021 its reverse (12012121211222), we get a palindrome (34223333332243).

The spelling of 22211212121021 in words is "twenty-two trillion, two hundred eleven billion, two hundred twelve million, one hundred twenty-one thousand, twenty-one".