21213543231703 has 2 divisors, whose sum is σ = 21213543231704. Its totient is φ = 21213543231702.

The previous prime is 21213543231697. The next prime is 21213543231761. The reversal of 21213543231703 is 30713234531212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21213543231703 - 2³³ = 21204953297111 is a prime.

It is a super-2 number, since 2×21213543231703² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21213543231763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606771615851 + 10606771615852.

It is an arithmetic number, because the mean of its divisors is an integer number (10606771615852).

Almost surely, 2^{21213543231703} is an apocalyptic number.

21213543231703 is a deficient number, since it is larger than the sum of its proper divisors (1).

21213543231703 is an equidigital number, since it uses as much as digits as its factorization.

21213543231703 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 37.

Adding to 21213543231703 its reverse (30713234531212), we get a palindrome (51926777762915).

The spelling of 21213543231703 in words is "twenty-one trillion, two hundred thirteen billion, five hundred forty-three million, two hundred thirty-one thousand, seven hundred three".