11212121011220 has 12 divisors (see below), whose sum is σ = 23545454123604. Its totient is φ = 4484848404480.

The previous prime is 11212121011213. The next prime is 11212121011243. The reversal of 11212121011220 is 2211012121211.

It can be written as a sum of positive squares in 2 ways, for example, as 2476632407824 + 8735488603396 = 1573732^2 + 2955586^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 280303025261 + ... + 280303025300.

It is an arithmetic number, because the mean of its divisors is an integer number (1962121176967).

Almost surely, 2^{11212121011220} is an apocalyptic number.

11212121011220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11212121011220 is an abundant number, since it is smaller than the sum of its proper divisors (12333333112384).

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

11212121011220 is a wasteful number, since it uses less digits than its factorization.

11212121011220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560606050570 (or 560606050568 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 11212121011220 its reverse (2211012121211), we get a palindrome (13423133132431).

The spelling of 11212121011220 in words is "eleven trillion, two hundred twelve billion, one hundred twenty-one million, eleven thousand, two hundred twenty".