1211212222020 has 72 divisors (see below), whose sum is σ = 3773308006104. Its totient is φ = 314260466688.

The previous prime is 1211212221997. The next prime is 1211212222063. The reversal of 1211212222020 is 202222121121.

It is a happy number.

1211212222020 is a `hidden beast` number, since 1 + 211 + 212 + 2 + 220 + 20 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 748031252544 + 463180969476 = 864888^2 + 680574^2 .

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 = 1211212221984 and 1211212222002.

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 23 ways as a sum of consecutive naturals, for example, 90925189 + ... + 90938508.

Almost surely, 2^{1211212222020} is an apocalyptic number.

1211212222020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211212222020 is an abundant number, since it is smaller than the sum of its proper divisors (2562095784084).

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

1211212222020 is a wasteful number, since it uses less digits than its factorization.

1211212222020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181863749 (or 181863744 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 1211212222020 its reverse (202222121121), we get a palindrome (1413434343141).

The spelling of 1211212222020 in words is "one trillion, two hundred eleven billion, two hundred twelve million, two hundred twenty-two thousand, twenty".