21123012001303 has 16 divisors (see below), whose sum is σ = 22216383205632. Its totient is φ = 20055409920000.

The previous prime is 21123012001199. The next prime is 21123012001319. The reversal of 21123012001303 is 30310021032112.

It is a cyclic number.

It is not a de Polignac number, because 21123012001303 - 2⁹ = 21123012000791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21123412001303) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72312183 + ... + 72603703.

It is an arithmetic number, because the mean of its divisors is an integer number (1388523950352).

Almost surely, 2^{21123012001303} is an apocalyptic number.

21123012001303 is a deficient number, since it is larger than the sum of its proper divisors (1093371204329).

21123012001303 is a wasteful number, since it uses less digits than its factorization.

21123012001303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335706.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21123012001303 its reverse (30310021032112), we get a palindrome (51433033033415).

The spelling of 21123012001303 in words is "twenty-one trillion, one hundred twenty-three billion, twelve million, one thousand, three hundred three".