21623545132203 has 64 divisors (see below), whose sum is σ = 33536248750080. Its totient is φ = 12137847321600.

The previous prime is 21623545132141. The next prime is 21623545132237. The reversal of 21623545132203 is 30223154532612.

It is not a de Polignac number, because 21623545132203 - 2⁴² = 17225498621099 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21623545132283) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 837492228 + ... + 837518046.

It is an arithmetic number, because the mean of its divisors is an integer number (524003886720).

Almost surely, 2^{21623545132203} is an apocalyptic number.

21623545132203 is a deficient number, since it is larger than the sum of its proper divisors (11912703617877).

21623545132203 is a wasteful number, since it uses less digits than its factorization.

21623545132203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27928.

The product of its (nonzero) digits is 259200, while the sum is 39.

Adding to 21623545132203 its reverse (30223154532612), we get a palindrome (51846699664815).

The spelling of 21623545132203 in words is "twenty-one trillion, six hundred twenty-three billion, five hundred forty-five million, one hundred thirty-two thousand, two hundred three".