21213543314623 has 32 divisors (see below), whose sum is σ = 25670857996800. Its totient is φ = 17302660848000.

The previous prime is 21213543314597. The next prime is 21213543314641. The reversal of 21213543314623 is 32641334531212.

It is not a de Polignac number, because 21213543314623 - 2⁹ = 21213543314111 is a prime.

It is a super-2 number, since 2×21213543314623² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213543314653) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21361288 + ... + 22332301.

It is an arithmetic number, because the mean of its divisors is an integer number (802214312400).

Almost surely, 2^{21213543314623} is an apocalyptic number.

21213543314623 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21213543314623 is a deficient number, since it is larger than the sum of its proper divisors (4457314682177).

21213543314623 is a wasteful number, since it uses less digits than its factorization.

21213543314623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43693743.

The product of its digits is 311040, while the sum is 40.

Adding to 21213543314623 its reverse (32641334531212), we get a palindrome (53854877845835).

The spelling of 21213543314623 in words is "twenty-one trillion, two hundred thirteen billion, five hundred forty-three million, three hundred fourteen thousand, six hundred twenty-three".