2145421004 has 12 divisors (see below), whose sum is σ = 3755000424. Its totient is φ = 1072563744.

The previous prime is 2145420989. The next prime is 2145421009. The reversal of 2145421004 is 4001245412.

It is not an unprimeable number, because it can be changed into a prime (2145421009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 359 + ... + 65505.

It is an arithmetic number, because the mean of its divisors is an integer number (312916702).

Almost surely, 2^2145421004 is an apocalyptic number.

It is an amenable number.

2145421004 is a deficient number, since it is larger than the sum of its proper divisors (1609579420).

2145421004 is a wasteful number, since it uses less digits than its factorization.

2145421004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73384 (or 73382 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 2145421004 is about 46318.6895755914. The cubic root of 2145421004 is about 1289.7459596299.

Adding to 2145421004 its reverse (4001245412), we get a palindrome (6146666416).

The spelling of 2145421004 in words is "two billion, one hundred forty-five million, four hundred twenty-one thousand, four".