21212122021122 has 16 divisors (see below), whose sum is σ = 42424480552320. Its totient is φ = 7070667922032.

The previous prime is 21212122021117. The next prime is 21212122021127. The reversal of 21212122021122 is 22112022121212.

It is an interprime number because it is at equal distance from previous prime (21212122021117) and next prime (21212122021127).

It is not an unprimeable number, because it can be changed into a prime (21212122021127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8677833 + ... + 10850300.

It is an arithmetic number, because the mean of its divisors is an integer number (2651530034520).

Almost surely, 2^{21212122021122} is an apocalyptic number.

21212122021122 is an abundant number, since it is smaller than the sum of its proper divisors (21212358531198).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21212122021122 is a wasteful number, since it uses less digits than its factorization.

21212122021122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19709177.

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

Adding to 21212122021122 its reverse (22112022121212), we get a palindrome (43324144142334).

The spelling of 21212122021122 in words is "twenty-one trillion, two hundred twelve billion, one hundred twenty-two million, twenty-one thousand, one hundred twenty-two".