212122012111220 has 24 divisors (see below), whose sum is σ = 445479219909864. Its totient is φ = 84844424944256.

The previous prime is 212122012111213. The next prime is 212122012111277. The reversal of 212122012111220 is 22111210221212.

It can be written as a sum of positive squares in 4 ways, for example, as 21603123143056 + 190518888968164 = 4647916^2 + 13802858^2 .

It is a super-2 number, since 2×212122012111220² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 212122012111192 and 212122012111201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 273346619 + ... + 274121538.

It is an arithmetic number, because the mean of its divisors is an integer number (18561634162911).

Almost surely, 2^{212122012111220} is an apocalyptic number.

212122012111220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212122012111220 is an abundant number, since it is smaller than the sum of its proper divisors (233357207798644).

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

212122012111220 is a wasteful number, since it uses less digits than its factorization.

212122012111220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547487539 (or 547487537 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 212122012111220 its reverse (22111210221212), we get a palindrome (234233222332432).

The spelling of 212122012111220 in words is "two hundred twelve trillion, one hundred twenty-two billion, twelve million, one hundred eleven thousand, two hundred twenty".