21145122003 has 16 divisors (see below), whose sum is σ = 28949814432. Its totient is φ = 13720224000.

The previous prime is 21145122001. The next prime is 21145122017. The reversal of 21145122003 is 30022154112.

It is not a de Polignac number, because 21145122003 - 2¹ = 21145122001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21145122001) 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 15 ways as a sum of consecutive naturals, for example, 152388 + ... + 255953.

It is an arithmetic number, because the mean of its divisors is an integer number (1809363402).

Almost surely, 2^21145122003 is an apocalyptic number.

21145122003 is a deficient number, since it is larger than the sum of its proper divisors (7804692429).

21145122003 is a wasteful number, since it uses less digits than its factorization.

21145122003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408806.

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 21145122003 its reverse (30022154112), we get a palindrome (51167276115).

The spelling of 21145122003 in words is "twenty-one billion, one hundred forty-five million, one hundred twenty-two thousand, three".