21122121023 has 2 divisors, whose sum is σ = 21122121024. Its totient is φ = 21122121022.

The previous prime is 21122121017. The next prime is 21122121037. The reversal of 21122121023 is 32012122112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21122121023 - 2¹² = 21122116927 is a prime.

It is a super-2 number, since 2×21122121023² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21122120992 and 21122121010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21122126023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561060511 + 10561060512.

It is an arithmetic number, because the mean of its divisors is an integer number (10561060512).

Almost surely, 2^21122121023 is an apocalyptic number.

21122121023 is a deficient number, since it is larger than the sum of its proper divisors (1).

21122121023 is an equidigital number, since it uses as much as digits as its factorization.

21122121023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21122121023 its reverse (32012122112), we get a palindrome (53134243135).

The spelling of 21122121023 in words is "twenty-one billion, one hundred twenty-two million, one hundred twenty-one thousand, twenty-three".