1404212121 has 24 divisors (see below), whose sum is σ = 2312823240. Its totient is φ = 813298176.

The previous prime is 1404212113. The next prime is 1404212143. The reversal of 1404212121 is 1212124041.

It can be written as a sum of positive squares in 4 ways, for example, as 456249600 + 947962521 = 21360^2 + 30789^2 .

It is not a de Polignac number, because 1404212121 - 2³ = 1404212113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1404212094 and 1404212103.

It is not an unprimeable number, because it can be changed into a prime (1404212021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 351006 + ... + 354983.

It is an arithmetic number, because the mean of its divisors is an integer number (96367635).

Almost surely, 2^1404212121 is an apocalyptic number.

It is an amenable number.

1404212121 is a deficient number, since it is larger than the sum of its proper divisors (908611119).

1404212121 is a wasteful number, since it uses less digits than its factorization.

1404212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 706025 (or 706022 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 1404212121 is about 37472.8184288292. The cubic root of 1404212121 is about 1119.8097362282.

Adding to 1404212121 its reverse (1212124041), we get a palindrome (2616336162).

The spelling of 1404212121 in words is "one billion, four hundred four million, two hundred twelve thousand, one hundred twenty-one".