2121147 has 48 divisors (see below), whose sum is σ = 3843840. Its totient is φ = 1143072.

The previous prime is 2121143. The next prime is 2121167. The reversal of 2121147 is 7411212.

It is not a de Polignac number, because 2121147 - 2² = 2121143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2121143) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 49308 + ... + 49350.

It is an arithmetic number, because the mean of its divisors is an integer number (80080).

2^2121147 is an apocalyptic number.

2121147 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

2121147 is a deficient number, since it is larger than the sum of its proper divisors (1722693).

2121147 is an equidigital number, since it uses as much as digits as its factorization.

2121147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94 (or 82 counting only the distinct ones).

The product of its digits is 112, while the sum is 18.

The square root of 2121147 is about 1456.4158060115. The cubic root of 2121147 is about 128.4863294011.

Adding to 2121147 its reverse (7411212), we get a palindrome (9532359).

The spelling of 2121147 in words is "two million, one hundred twenty-one thousand, one hundred forty-seven".