1212210401 has 4 divisors (see below), whose sum is σ = 1232756400. Its totient is φ = 1191664404.

The previous prime is 1212210397. The next prime is 1212210413. The reversal of 1212210401 is 1040122121.

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.

It is a cyclic number.

It is not a de Polignac number, because 1212210401 - 2² = 1212210397 is a prime.

It is a super-3 number, since 3×1212210401³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212210451) 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, 10272911 + ... + 10273028.

It is an arithmetic number, because the mean of its divisors is an integer number (308189100).

Almost surely, 2^1212210401 is an apocalyptic number.

It is an amenable number.

1212210401 is a deficient number, since it is larger than the sum of its proper divisors (20545999).

1212210401 is an equidigital number, since it uses as much as digits as its factorization.

1212210401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20545998.

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

The square root of 1212210401 is about 34816.8120453324. The cubic root of 1212210401 is about 1066.2507148477.

Adding to 1212210401 its reverse (1040122121), we get a palindrome (2252332522).

The spelling of 1212210401 in words is "one billion, two hundred twelve million, two hundred ten thousand, four hundred one".