1210021121 has 8 divisors (see below), whose sum is σ = 1299245184. Its totient is φ = 1122802240.

The previous prime is 1210021093. The next prime is 1210021133. The reversal of 1210021121 is 1211200121.

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 1210021121 - 2²⁶ = 1142912257 is a prime.

It is a super-2 number, since 2×1210021121² = 2928302226532193282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1210021181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 500045 + ... + 502458.

It is an arithmetic number, because the mean of its divisors is an integer number (162405648).

Almost surely, 2^1210021121 is an apocalyptic number.

It is an amenable number.

1210021121 is a deficient number, since it is larger than the sum of its proper divisors (89224063).

1210021121 is a wasteful number, since it uses less digits than its factorization.

1210021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1002591.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 1210021121 is about 34785.3578535567. The cubic root of 1210021121 is about 1065.6084368916.

Adding to 1210021121 its reverse (1211200121), we get a palindrome (2421221242).

The spelling of 1210021121 in words is "one billion, two hundred ten million, twenty-one thousand, one hundred twenty-one".