2145234021 has 32 divisors (see below), whose sum is σ = 3353011200. Its totient is φ = 1194395520.

The previous prime is 2145234011. The next prime is 2145234037. The reversal of 2145234021 is 1204325412.

It is not a de Polignac number, because 2145234021 - 2⁹ = 2145233509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2145233982 and 2145234000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145234001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1083010 + ... + 1084988.

It is an arithmetic number, because the mean of its divisors is an integer number (104781600).

Almost surely, 2^2145234021 is an apocalyptic number.

2145234021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2145234021 is a deficient number, since it is larger than the sum of its proper divisors (1207777179).

2145234021 is a wasteful number, since it uses less digits than its factorization.

2145234021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3289.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 2145234021 is about 46316.6710915195. The cubic root of 2145234021 is about 1289.7084895055.

Adding to 2145234021 its reverse (1204325412), we get a palindrome (3349559433).

The spelling of 2145234021 in words is "two billion, one hundred forty-five million, two hundred thirty-four thousand, twenty-one".