21123023035 has 4 divisors (see below), whose sum is σ = 25347627648. Its totient is φ = 16898418424.

The previous prime is 21123023029. The next prime is 21123023063. The reversal of 21123023035 is 53032032112.

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 21123023035 - 2¹¹ = 21123020987 is a prime.

It is a super-2 number, since 2×21123023035² (a number of 21 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 = 21123022997 and 21123023015.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2112302299 + ... + 2112302308.

It is an arithmetic number, because the mean of its divisors is an integer number (6336906912).

Almost surely, 2^21123023035 is an apocalyptic number.

21123023035 is a deficient number, since it is larger than the sum of its proper divisors (4224604613).

21123023035 is an equidigital number, since it uses as much as digits as its factorization.

21123023035 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4224604612.

The product of its (nonzero) digits is 1080, while the sum is 22.

Adding to 21123023035 its reverse (53032032112), we get a palindrome (74155055147).

The spelling of 21123023035 in words is "twenty-one billion, one hundred twenty-three million, twenty-three thousand, thirty-five".