11212122101220 has 72 divisors (see below), whose sum is σ = 34929295719864. Its totient is φ = 2909091138048.

The previous prime is 11212122101197. The next prime is 11212122101221. The reversal of 11212122101220 is 2210122121211.

11212122101220 is a `hidden beast` number, since 1 + 1 + 21 + 212 + 210 + 1 + 220 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 2764158955776 + 8447963145444 = 1662576^2 + 2906538^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 11212122101193 and 11212122101202.

It is not an unprimeable number, because it can be changed into a prime (11212122101221) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 841744249 + ... + 841757568.

Almost surely, 2^{11212122101220} is an apocalyptic number.

11212122101220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11212122101220 is an abundant number, since it is smaller than the sum of its proper divisors (23717173618644).

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

11212122101220 is a wasteful number, since it uses less digits than its factorization.

11212122101220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1683501869 (or 1683501864 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 11212122101220 its reverse (2210122121211), we get a palindrome (13422244222431).

The spelling of 11212122101220 in words is "eleven trillion, two hundred twelve billion, one hundred twenty-two million, one hundred one thousand, two hundred twenty".