21122021212102 has 16 divisors (see below), whose sum is σ = 34703523696960. Its totient is φ = 9597023836288.

The previous prime is 21122021212013. The next prime is 21122021212109. The reversal of 21122021212102 is 20121212022112.

It is a super-2 number, since 2×21122021212102² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21122021212102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122021212109) 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, 10710963118 + ... + 10710965089.

It is an arithmetic number, because the mean of its divisors is an integer number (2168970231060).

Almost surely, 2^{21122021212102} is an apocalyptic number.

21122021212102 is a deficient number, since it is larger than the sum of its proper divisors (13581502484858).

21122021212102 is a wasteful number, since it uses less digits than its factorization.

21122021212102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21421928255.

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

Adding to 21122021212102 its reverse (20121212022112), we get a palindrome (41243233234214).

The spelling of 21122021212102 in words is "twenty-one trillion, one hundred twenty-two billion, twenty-one million, two hundred twelve thousand, one hundred two".