1211112021 has 16 divisors (see below), whose sum is σ = 1849309184. Its totient is φ = 690637104.

The previous prime is 1211112017. The next prime is 1211112043. The reversal of 1211112021 is 1202111121.

It is not a de Polignac number, because 1211112021 - 2² = 1211112017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211111988 and 1211112006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211152021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48985 + ... + 69438.

It is an arithmetic number, because the mean of its divisors is an integer number (115581824).

Almost surely, 2^1211112021 is an apocalyptic number.

It is an amenable number.

1211112021 is a deficient number, since it is larger than the sum of its proper divisors (638197163).

1211112021 is a wasteful number, since it uses less digits than its factorization.

1211112021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118920.

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

The square root of 1211112021 is about 34801.0347690985. The cubic root of 1211112021 is about 1065.9285754012.

Adding to 1211112021 its reverse (1202111121), we get a palindrome (2413223142).

The spelling of 1211112021 in words is "one billion, two hundred eleven million, one hundred twelve thousand, twenty-one".