1201212021 has 4 divisors (see below), whose sum is σ = 1601616032. Its totient is φ = 800808012.

The previous prime is 1201211971. The next prime is 1201212043. The reversal of 1201212021 is 1202121021.

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 not a de Polignac number, because 1201212021 - 2⁹ = 1201211509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1201211988 and 1201212006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201212071) 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, 200202001 + ... + 200202006.

It is an arithmetic number, because the mean of its divisors is an integer number (400404008).

Almost surely, 2^1201212021 is an apocalyptic number.

It is an amenable number.

1201212021 is a deficient number, since it is larger than the sum of its proper divisors (400404011).

1201212021 is an equidigital number, since it uses as much as digits as its factorization.

1201212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400404010.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1201212021 is about 34658.5057525566. The cubic root of 1201212021 is about 1063.0162167167.

Adding to 1201212021 its reverse (1202121021), we get a palindrome (2403333042).

The spelling of 1201212021 in words is "one billion, two hundred one million, two hundred twelve thousand, twenty-one".