2145021450 has 144 divisors (see below), whose sum is σ = 6297701088. Its totient is φ = 479952000.

The previous prime is 2145021443. The next prime is 2145021457. The reversal of 2145021450 is 541205412.

It is an interprime number because it is at equal distance from previous prime (2145021443) and next prime (2145021457).

It is a super-2 number, since 2×2145021450² = 9202234041920205000, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2145021450.

It is not an unprimeable number, because it can be changed into a prime (2145021457) 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 71 ways as a sum of consecutive naturals, for example, 231405 + ... + 240495.

Almost surely, 2^2145021450 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2145021450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3148850544).

2145021450 is an abundant number, since it is smaller than the sum of its proper divisors (4152679638).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2145021450 is a wasteful number, since it uses less digits than its factorization.

2145021450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9141 (or 9125 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 2145021450 is about 46314.3762777823. The cubic root of 2145021450 is about 1289.6658890749.

Adding to 2145021450 its reverse (541205412), we get a palindrome (2686226862).

The spelling of 2145021450 in words is "two billion, one hundred forty-five million, twenty-one thousand, four hundred fifty".