21123223221301 has 4 divisors (see below), whose sum is σ = 21125434855104. Its totient is φ = 21121011587500.

The previous prime is 21123223221271. The next prime is 21123223221323. The reversal of 21123223221301 is 10312232232112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21123223221301 - 2⁹ = 21123223220789 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 (21123223221901) 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, 1105802575 + ... + 1105821676.

It is an arithmetic number, because the mean of its divisors is an integer number (5281358713776).

Almost surely, 2^{21123223221301} is an apocalyptic number.

It is an amenable number.

21123223221301 is a deficient number, since it is larger than the sum of its proper divisors (2211633803).

21123223221301 is an equidigital number, since it uses as much as digits as its factorization.

21123223221301 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2211633802.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 21123223221301 its reverse (10312232232112), we get a palindrome (31435455453413).

The spelling of 21123223221301 in words is "twenty-one trillion, one hundred twenty-three billion, two hundred twenty-three million, two hundred twenty-one thousand, three hundred one".