1211122121 has 8 divisors (see below), whose sum is σ = 1342884288. Its totient is φ = 1082970000.

The previous prime is 1211122103. The next prime is 1211122127. The reversal of 1211122121 is 1212211121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1211122121 - 2¹⁸ = 1210859977 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211122096 and 1211122105.

It is not an unprimeable number, because it can be changed into a prime (1211122127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 901805 + ... + 903146.

It is an arithmetic number, because the mean of its divisors is an integer number (167860536).

Almost surely, 2^1211122121 is an apocalyptic number.

1211122121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1211122121 is a deficient number, since it is larger than the sum of its proper divisors (131762167).

1211122121 is a wasteful number, since it uses less digits than its factorization.

1211122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1805023.

The product of its digits is 16, while the sum is 14.

The square root of 1211122121 is about 34801.1798794236. The cubic root of 1211122121 is about 1065.9315384766.

Adding to 1211122121 its reverse (1212211121), we get a palindrome (2423333242).

The spelling of 1211122121 in words is "one billion, two hundred eleven million, one hundred twenty-two thousand, one hundred twenty-one".