1210112021 has 8 divisors (see below), whose sum is σ = 1228932504. Its totient is φ = 1191352320.

The previous prime is 1210112009. The next prime is 1210112027. The reversal of 1210112021 is 1202110121.

It can be written as a sum of positive squares in 4 ways, for example, as 46225 + 1210065796 = 215^2 + 34786^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1210112021 is a prime.

It is a super-2 number, since 2×1210112021² = 2928742206737408882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1210111993 and 1210112011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210112027) 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, 25781 + ... + 55541.

It is an arithmetic number, because the mean of its divisors is an integer number (153616563).

Almost surely, 2^1210112021 is an apocalyptic number.

It is an amenable number.

1210112021 is a deficient number, since it is larger than the sum of its proper divisors (18820483).

1210112021 is an equidigital number, since it uses as much as digits as its factorization.

1210112021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30391.

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

The square root of 1210112021 is about 34786.6644132489. The cubic root of 1210112021 is about 1065.6351200020.

Adding to 1210112021 its reverse (1202110121), we get a palindrome (2412222142).

The spelling of 1210112021 in words is "one billion, two hundred ten million, one hundred twelve thousand, twenty-one".