1211021212122 has 20 divisors (see below), whose sum is σ = 2713584568266. Its totient is φ = 403673737320.

The previous prime is 1211021212103. The next prime is 1211021212123. The reversal of 1211021212122 is 2212121201121.

It can be written as a sum of positive squares in only one way, i.e., 612933975801 + 598087236321 = 782901^2 + 773361^2 .

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 = 1211021212095 and 1211021212104.

It is not an unprimeable number, because it can be changed into a prime (1211021212123) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3737719629 + ... + 3737719952.

Almost surely, 2^{1211021212122} is an apocalyptic number.

1211021212122 is an abundant number, since it is smaller than the sum of its proper divisors (1502563356144).

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

1211021212122 is an equidigital number, since it uses as much as digits as its factorization.

1211021212122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7475439595 (or 7475439586 counting only the distinct ones).

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

Adding to 1211021212122 its reverse (2212121201121), we get a palindrome (3423142413243).

The spelling of 1211021212122 in words is "one trillion, two hundred eleven billion, twenty-one million, two hundred twelve thousand, one hundred twenty-two".