21122123 has 12 divisors (see below), whose sum is σ = 23349480. Its totient is φ = 19092480.

The previous prime is 21122111. The next prime is 21122161. The reversal of 21122123 is 32122112.

It is a happy number.

It is not a de Polignac number, because 21122123 - 2¹⁰ = 21121099 is a prime.

It is a super-2 number, since 2×21122123² = 892288160054258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21122098 and 21122107.

It is not an unprimeable number, because it can be changed into a prime (21122183) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27083 + ... + 27851.

It is an arithmetic number, because the mean of its divisors is an integer number (1945790).

Almost surely, 2^21122123 is an apocalyptic number.

21122123 is a deficient number, since it is larger than the sum of its proper divisors (2227357).

21122123 is a wasteful number, since it uses less digits than its factorization.

21122123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1018 (or 1007 counting only the distinct ones).

The product of its digits is 48, while the sum is 14.

The square root of 21122123 is about 4595.8810907159. The cubic root of 21122123 is about 276.4261907768.

Adding to 21122123 its reverse (32122112), we get a palindrome (53244235).

The spelling of 21122123 in words is "twenty-one million, one hundred twenty-two thousand, one hundred twenty-three".