2112152021 has 4 divisors (see below), whose sum is σ = 2413888032. Its totient is φ = 1810416012.

The previous prime is 2112151991. The next prime is 2112152051. The reversal of 2112152021 is 1202512112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (2112151991) and next prime (2112152051).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2112152021 is a prime.

It is a super-2 number, since 2×2112152021² = 8922372319628768882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2112152051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 150867995 + ... + 150868008.

It is an arithmetic number, because the mean of its divisors is an integer number (603472008).

Almost surely, 2^2112152021 is an apocalyptic number.

It is an amenable number.

2112152021 is a deficient number, since it is larger than the sum of its proper divisors (301736011).

2112152021 is an equidigital number, since it uses as much as digits as its factorization.

2112152021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301736010.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 2112152021 is about 45958.1551087508. The cubic root of 2112152021 is about 1283.0445148820.

Adding to 2112152021 its reverse (1202512112), we get a palindrome (3314664133).

The spelling of 2112152021 in words is "two billion, one hundred twelve million, one hundred fifty-two thousand, twenty-one".