21123322122031 has 4 divisors (see below), whose sum is σ = 21211704223200. Its totient is φ = 21034940020864.

The previous prime is 21123322121977. The next prime is 21123322122037. The reversal of 21123322122031 is 13022122332112.

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 21123322122031 - 2⁴¹ = 18924298866479 is a prime.

It is a super-2 number, since 2×21123322122031² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21123322121987 and 21123322122005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21123322122037) 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, 44191050226 + ... + 44191050703.

It is an arithmetic number, because the mean of its divisors is an integer number (5302926055800).

Almost surely, 2^{21123322122031} is an apocalyptic number.

21123322122031 is a deficient number, since it is larger than the sum of its proper divisors (88382101169).

21123322122031 is an equidigital number, since it uses as much as digits as its factorization.

21123322122031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88382101168.

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

Adding to 21123322122031 its reverse (13022122332112), we get a palindrome (34145444454143).

The spelling of 21123322122031 in words is "twenty-one trillion, one hundred twenty-three billion, three hundred twenty-two million, one hundred twenty-two thousand, thirty-one".