1421232121 has 4 divisors (see below), whose sum is σ = 1428596212. Its totient is φ = 1413868032.

The previous prime is 1421232119. The next prime is 1421232139. The reversal of 1421232121 is 1212321241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1212321241 = 1229 ⋅986429.

It can be written as a sum of positive squares in 2 ways, for example, as 911375721 + 509856400 = 30189^2 + 22580^2 .

It is a cyclic number.

It is not a de Polignac number, because 1421232121 - 2¹ = 1421232119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1421232191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3681756 + ... + 3682141.

It is an arithmetic number, because the mean of its divisors is an integer number (357149053).

Almost surely, 2^1421232121 is an apocalyptic number.

It is an amenable number.

1421232121 is a deficient number, since it is larger than the sum of its proper divisors (7364091).

1421232121 is an equidigital number, since it uses as much as digits as its factorization.

1421232121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7364090.

The product of its digits is 192, while the sum is 19.

The square root of 1421232121 is about 37699.2323661902. The cubic root of 1421232121 is about 1124.3158628274.

Adding to 1421232121 its reverse (1212321241), we get a palindrome (2633553362).

The spelling of 1421232121 in words is "one billion, four hundred twenty-one million, two hundred thirty-two thousand, one hundred twenty-one".