2123232121 has 16 divisors (see below), whose sum is σ = 2250915840. Its totient is φ = 1997202960.

The previous prime is 2123232091. The next prime is 2123232131. The reversal of 2123232121 is 1212323212.

2123232121 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is a cyclic number.

It is not a de Polignac number, because 2123232121 - 2¹³ = 2123223929 is a prime.

It is a super-2 number, since 2×2123232121² = 9016229279292317282, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2123232131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2058876 + ... + 2059906.

It is an arithmetic number, because the mean of its divisors is an integer number (140682240).

Almost surely, 2^2123232121 is an apocalyptic number.

It is an amenable number.

2123232121 is a deficient number, since it is larger than the sum of its proper divisors (127683719).

2123232121 is a wasteful number, since it uses less digits than its factorization.

2123232121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1716.

The product of its digits is 288, while the sum is 19.

The square root of 2123232121 is about 46078.5429565649. The cubic root of 2123232121 is about 1285.2841697682.

Adding to 2123232121 its reverse (1212323212), we get a palindrome (3335555333).

The spelling of 2123232121 in words is "two billion, one hundred twenty-three million, two hundred thirty-two thousand, one hundred twenty-one".