1201212001 has 4 divisors (see below), whose sum is σ = 1310413104. Its totient is φ = 1092010900.

The previous prime is 1201211971. The next prime is 1201212043. The reversal of 1201212001 is 1002121021.

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: 1002121021 = 11 ⋅91101911.

It is a cyclic number.

It is not a de Polignac number, because 1201212001 - 2⁷ = 1201211873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1201212071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54600535 + ... + 54600556.

It is an arithmetic number, because the mean of its divisors is an integer number (327603276).

Almost surely, 2^1201212001 is an apocalyptic number.

1201212001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1201212001 is a deficient number, since it is larger than the sum of its proper divisors (109201103).

1201212001 is a wasteful number, since it uses less digits than its factorization.

1201212001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109201102.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 1201212001 is about 34658.5054640272. The cubic root of 1201212001 is about 1063.0162108170.

Adding to 1201212001 its reverse (1002121021), we get a palindrome (2203333022).

It can be divided in two parts, 120 and 1212001, that added together give a palindrome (1212121).

The spelling of 1201212001 in words is "one billion, two hundred one million, two hundred twelve thousand, one".