1211222111020 has 12 divisors (see below), whose sum is σ = 2543566433184. Its totient is φ = 484488844400.

The previous prime is 1211222111017. The next prime is 1211222111051. The reversal of 1211222111020 is 201112221121.

It is a junction number, because it is equal to n+sod(n) for n = 1211222110985 and 1211222111003.

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, 30280552756 + ... + 30280552795.

It is an arithmetic number, because the mean of its divisors is an integer number (211963869432).

Almost surely, 2^{1211222111020} is an apocalyptic number.

1211222111020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211222111020 is an abundant number, since it is smaller than the sum of its proper divisors (1332344322164).

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

1211222111020 is a wasteful number, since it uses less digits than its factorization.

1211222111020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60561105560 (or 60561105558 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1211222111020 its reverse (201112221121), we get a palindrome (1412334332141).

The spelling of 1211222111020 in words is "one trillion, two hundred eleven billion, two hundred twenty-two million, one hundred eleven thousand, twenty".