2121123103 has 6 divisors (see below), whose sum is σ = 2331482552. Its totient is φ = 1928293620.

The previous prime is 2121123091. The next prime is 2121123127. The reversal of 2121123103 is 3013211212.

It is not a de Polignac number, because 2121123103 - 2¹⁷ = 2120992031 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121123163) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8764851 + ... + 8765092.

Almost surely, 2^2121123103 is an apocalyptic number.

2121123103 is a deficient number, since it is larger than the sum of its proper divisors (210359449).

2121123103 is a wasteful number, since it uses less digits than its factorization.

2121123103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17529965 (or 17529954 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 2121123103 is about 46055.6522372662. The cubic root of 2121123103 is about 1284.8584688707.

Adding to 2121123103 its reverse (3013211212), we get a palindrome (5134334315).

The spelling of 2121123103 in words is "two billion, one hundred twenty-one million, one hundred twenty-three thousand, one hundred three".