21122101023 has 4 divisors (see below), whose sum is σ = 28162801368. Its totient is φ = 14081400680.

The previous prime is 21122101009. The next prime is 21122101081. The reversal of 21122101023 is 32010122112.

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 21122101023 - 2¹⁸ = 21121838879 is a prime.

It is a super-2 number, since 2×21122101023² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21122100993 and 21122101011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122121023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3520350168 + ... + 3520350173.

It is an arithmetic number, because the mean of its divisors is an integer number (7040700342).

Almost surely, 2^21122101023 is an apocalyptic number.

21122101023 is a deficient number, since it is larger than the sum of its proper divisors (7040700345).

21122101023 is an equidigital number, since it uses as much as digits as its factorization.

21122101023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7040700344.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21122101023 its reverse (32010122112), we get a palindrome (53132223135).

The spelling of 21122101023 in words is "twenty-one billion, one hundred twenty-two million, one hundred one thousand, twenty-three".