1214204021 has 4 divisors (see below), whose sum is σ = 1214723712. Its totient is φ = 1213684332.

The previous prime is 1214203979. The next prime is 1214204051. The reversal of 1214204021 is 1204024121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1204024121 = 173 ⋅6959677.

It is a cyclic number.

It is not a de Polignac number, because 1214204021 - 2⁶ = 1214203957 is a prime.

It is a super-2 number, since 2×1214204021² = 2948582809225136882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1214204051) 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, 256325 + ... + 261018.

It is an arithmetic number, because the mean of its divisors is an integer number (303680928).

Almost surely, 2^1214204021 is an apocalyptic number.

It is an amenable number.

1214204021 is a deficient number, since it is larger than the sum of its proper divisors (519691).

1214204021 is an equidigital number, since it uses as much as digits as its factorization.

1214204021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 519690.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 1214204021 is about 34845.4304177750. The cubic root of 1214204021 is about 1066.8349188476.

Adding to 1214204021 its reverse (1204024121), we get a palindrome (2418228142).

The spelling of 1214204021 in words is "one billion, two hundred fourteen million, two hundred four thousand, twenty-one".