212212211101220 has 48 divisors (see below), whose sum is σ = 486270929793600. Its totient is φ = 77150291656320.

The previous prime is 212212211101217. The next prime is 212212211101229. The reversal of 212212211101220 is 22101112212212.

It is a super-2 number, since 2×212212211101220² (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 = 212212211101192 and 212212211101201.

It is not an unprimeable number, because it can be changed into a prime (212212211101229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110200175 + ... + 112109334.

It is an arithmetic number, because the mean of its divisors is an integer number (10130644370700).

Almost surely, 2^{212212211101220} is an apocalyptic number.

212212211101220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212212211101220 is an abundant number, since it is smaller than the sum of its proper divisors (274058718692380).

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

212212211101220 is a wasteful number, since it uses less digits than its factorization.

212212211101220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222313868 (or 222313866 counting only the distinct ones).

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

Adding to 212212211101220 its reverse (22101112212212), we get a palindrome (234313323313432).

The spelling of 212212211101220 in words is "two hundred twelve trillion, two hundred twelve billion, two hundred eleven million, one hundred one thousand, two hundred twenty".