1211021121 has 8 divisors (see below), whose sum is σ = 1670374080. Its totient is φ = 779507792.

The previous prime is 1211021117. The next prime is 1211021143. The reversal of 1211021121 is 1211201121.

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 1211021121 - 2² = 1211021117 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1211021097 and 1211021106.

It is not an unprimeable number, because it can be changed into a prime (1211021111) 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, 6959805 + ... + 6959978.

It is an arithmetic number, because the mean of its divisors is an integer number (208796760).

Almost surely, 2^1211021121 is an apocalyptic number.

It is an amenable number.

1211021121 is a deficient number, since it is larger than the sum of its proper divisors (459352959).

1211021121 is a wasteful number, since it uses less digits than its factorization.

1211021121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13919815.

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

The square root of 1211021121 is about 34799.7287489429. The cubic root of 1211021121 is about 1065.9019069813.

Adding to 1211021121 its reverse (1211201121), we get a palindrome (2422222242).

The spelling of 1211021121 in words is "one billion, two hundred eleven million, twenty-one thousand, one hundred twenty-one".