1211113021 has 8 divisors (see below), whose sum is σ = 1226998784. Its totient is φ = 1195326720.

The previous prime is 1211113003. The next prime is 1211113027. The reversal of 1211113021 is 1203111121.

It is a happy number.

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 1211113021 - 2⁷ = 1211112893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211112992 and 1211113010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211113027) 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, 195 + ... + 49216.

It is an arithmetic number, because the mean of its divisors is an integer number (153374848).

Almost surely, 2^1211113021 is an apocalyptic number.

It is an amenable number.

1211113021 is a deficient number, since it is larger than the sum of its proper divisors (15885763).

1211113021 is a wasteful number, since it uses less digits than its factorization.

1211113021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49731.

The product of its (nonzero) digits is 12, while the sum is 13.

The square root of 1211113021 is about 34801.0491364844. The cubic root of 1211113021 is about 1065.9288687757.

Adding to 1211113021 its reverse (1203111121), we get a palindrome (2414224142).

The spelling of 1211113021 in words is "one billion, two hundred eleven million, one hundred thirteen thousand, twenty-one".