1211420401 has 4 divisors (see below), whose sum is σ = 1218852592. Its totient is φ = 1203988212.

The previous prime is 1211420383. The next prime is 1211420407. The reversal of 1211420401 is 1040241121.

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: 1040241121 = 5801 ⋅179321.

It is a cyclic number.

It is not a de Polignac number, because 1211420401 - 2⁵ = 1211420369 is a prime.

It is a super-3 number, since 3×1211420401³ (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 (1211420407) 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, 3715851 + ... + 3716176.

It is an arithmetic number, because the mean of its divisors is an integer number (304713148).

Almost surely, 2^1211420401 is an apocalyptic number.

It is an amenable number.

1211420401 is a deficient number, since it is larger than the sum of its proper divisors (7432191).

1211420401 is an equidigital number, since it uses as much as digits as its factorization.

1211420401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7432190.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 1211420401 is about 34805.4651024807. The cubic root of 1211420401 is about 1066.0190385879.

Adding to 1211420401 its reverse (1040241121), we get a palindrome (2251661522).

The spelling of 1211420401 in words is "one billion, two hundred eleven million, four hundred twenty thousand, four hundred one".