1211012121 has 32 divisors (see below), whose sum is σ = 1816246656. Its totient is φ = 711360000.

The previous prime is 1211012113. The next prime is 1211012137. The reversal of 1211012121 is 1212101121.

It is not a de Polignac number, because 1211012121 - 2³ = 1211012113 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1211012097 and 1211012106.

It is not an unprimeable number, because it can be changed into a prime (1211012161) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 209571 + ... + 215271.

It is an arithmetic number, because the mean of its divisors is an integer number (56757708).

Almost surely, 2^1211012121 is an apocalyptic number.

1211012121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1211012121 is a deficient number, since it is larger than the sum of its proper divisors (605234535).

1211012121 is a wasteful number, since it uses less digits than its factorization.

1211012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5913.

The product of its (nonzero) digits is 8, while the sum is 12.

The square root of 1211012121 is about 34799.5994373499. The cubic root of 1211012121 is about 1065.8992664711.

Adding to 1211012121 its reverse (1212101121), we get a palindrome (2423113242).

The spelling of 1211012121 in words is "one billion, two hundred eleven million, twelve thousand, one hundred twenty-one".