1012211121 has 16 divisors (see below), whose sum is σ = 1368057600. Its totient is φ = 665603328.

The previous prime is 1012211107. The next prime is 1012211131. The reversal of 1012211121 is 1211122101.

It is not a de Polignac number, because 1012211121 - 2⁹ = 1012210609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1012211097 and 1012211106.

It is not an unprimeable number, because it can be changed into a prime (1012211131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 386665 + ... + 389273.

It is an arithmetic number, because the mean of its divisors is an integer number (85503600).

Almost surely, 2^1012211121 is an apocalyptic number.

It is an amenable number.

1012211121 is a deficient number, since it is larger than the sum of its proper divisors (355846479).

1012211121 is a wasteful number, since it uses less digits than its factorization.

1012211121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4328.

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

The square root of 1012211121 is about 31815.2655340168. The cubic root of 1012211121 is about 1004.0539172142.

Adding to 1012211121 its reverse (1211122101), we get a palindrome (2223333222).

The spelling of 1012211121 in words is "one billion, twelve million, two hundred eleven thousand, one hundred twenty-one".