21623522201263 has 4 divisors (see below), whose sum is σ = 21814880804928. Its totient is φ = 21432163597600.

The previous prime is 21623522201231. The next prime is 21623522201269. The reversal of 21623522201263 is 36210222532612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21623522201263 - 2⁵ = 21623522201231 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 (21623522201269) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95679301663 + ... + 95679301888.

It is an arithmetic number, because the mean of its divisors is an integer number (5453720201232).

Almost surely, 2^{21623522201263} is an apocalyptic number.

21623522201263 is a deficient number, since it is larger than the sum of its proper divisors (191358603665).

21623522201263 is a wasteful number, since it uses less digits than its factorization.

21623522201263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191358603664.

The product of its (nonzero) digits is 103680, while the sum is 37.

Adding to 21623522201263 its reverse (36210222532612), we get a palindrome (57833744733875).

The spelling of 21623522201263 in words is "twenty-one trillion, six hundred twenty-three billion, five hundred twenty-two million, two hundred one thousand, two hundred sixty-three".