21145010123 has 2 divisors, whose sum is σ = 21145010124. Its totient is φ = 21145010122.

The previous prime is 21145010113. The next prime is 21145010143. The reversal of 21145010123 is 32101054112.

It is an a-pointer prime, because the next prime (21145010143) can be obtained adding 21145010123 to its sum of digits (20).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21145010123 - 2¹² = 21145006027 is a prime.

It is a super-2 number, since 2×21145010123² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21145010095 and 21145010104.

It is not a weakly prime, because it can be changed into another prime (21145010113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10572505061 + 10572505062.

It is an arithmetic number, because the mean of its divisors is an integer number (10572505062).

Almost surely, 2^21145010123 is an apocalyptic number.

21145010123 is a deficient number, since it is larger than the sum of its proper divisors (1).

21145010123 is an equidigital number, since it uses as much as digits as its factorization.

21145010123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 20.

Adding to 21145010123 its reverse (32101054112), we get a palindrome (53246064235).

The spelling of 21145010123 in words is "twenty-one billion, one hundred forty-five million, ten thousand, one hundred twenty-three".