11212121001220 has 24 divisors (see below), whose sum is σ = 24304984881408. Its totient is φ = 4340175871200.

The previous prime is 11212121001163. The next prime is 11212121001253. The reversal of 11212121001220 is 2210012121211.

It is a junction number, because it is equal to n+sod(n) for n = 11212121001194 and 11212121001203.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9042032446 + ... + 9042033685.

It is an arithmetic number, because the mean of its divisors is an integer number (1012707703392).

Almost surely, 2^{11212121001220} is an apocalyptic number.

11212121001220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11212121001220 is an abundant number, since it is smaller than the sum of its proper divisors (13092863880188).

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

11212121001220 is a wasteful number, since it uses less digits than its factorization.

11212121001220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18084066171 (or 18084066169 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 11212121001220 its reverse (2210012121211), we get a palindrome (13422133122431).

The spelling of 11212121001220 in words is "eleven trillion, two hundred twelve billion, one hundred twenty-one million, one thousand, two hundred twenty".