1210204121 has 4 divisors (see below), whose sum is σ = 1383090432. Its totient is φ = 1037317812.

The previous prime is 1210204117. The next prime is 1210204139. The reversal of 1210204121 is 1214020121.

It is a happy number.

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: 1214020121 = 5417 ⋅224113.

It is a cyclic number.

It is not a de Polignac number, because 1210204121 - 2² = 1210204117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1210204096 and 1210204105.

It is not an unprimeable number, because it can be changed into a prime (1210204921) 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, 86443145 + ... + 86443158.

It is an arithmetic number, because the mean of its divisors is an integer number (345772608).

Almost surely, 2^1210204121 is an apocalyptic number.

It is an amenable number.

1210204121 is a deficient number, since it is larger than the sum of its proper divisors (172886311).

1210204121 is an equidigital number, since it uses as much as digits as its factorization.

1210204121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172886310.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 1210204121 is about 34787.9881712065. The cubic root of 1210204121 is about 1065.6621540019.

Adding to 1210204121 its reverse (1214020121), we get a palindrome (2424224242).

The spelling of 1210204121 in words is "one billion, two hundred ten million, two hundred four thousand, one hundred twenty-one".