1121211021 has 16 divisors (see below), whose sum is σ = 1767427200. Its totient is φ = 618598848.

The previous prime is 1121211017. The next prime is 1121211023. The reversal of 1121211021 is 1201121211.

It is not a de Polignac number, because 1121211021 - 2² = 1121211017 is a prime.

It is a super-2 number, since 2×1121211021² = 2514228307223724882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1121210988 and 1121211006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121211023) 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 15 ways as a sum of consecutive naturals, for example, 919926 + ... + 921143.

It is an arithmetic number, because the mean of its divisors is an integer number (110464200).

Almost surely, 2^1121211021 is an apocalyptic number.

It is an amenable number.

1121211021 is a deficient number, since it is larger than the sum of its proper divisors (646216179).

1121211021 is a wasteful number, since it uses less digits than its factorization.

1121211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1841108.

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

The square root of 1121211021 is about 33484.4892599544. The cubic root of 1121211021 is about 1038.8729843191.

Adding to 1121211021 its reverse (1201121211), we get a palindrome (2322332232).

The spelling of 1121211021 in words is "one billion, one hundred twenty-one million, two hundred eleven thousand, twenty-one".