1212001112021 has 4 divisors (see below), whose sum is σ = 1385144128032. Its totient is φ = 1038858096012.

The previous prime is 1212001112017. The next prime is 1212001112027. The reversal of 1212001112021 is 1202111002121.

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 1212001112021 - 2² = 1212001112017 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1212001111987 and 1212001112005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212001112027) 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, 86571507995 + ... + 86571508008.

It is an arithmetic number, because the mean of its divisors is an integer number (346286032008).

Almost surely, 2^{1212001112021} is an apocalyptic number.

It is an amenable number.

1212001112021 is a deficient number, since it is larger than the sum of its proper divisors (173143016011).

1212001112021 is an equidigital number, since it uses as much as digits as its factorization.

1212001112021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173143016010.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1212001112021 its reverse (1202111002121), we get a palindrome (2414112114142).

The spelling of 1212001112021 in words is "one trillion, two hundred twelve billion, one million, one hundred twelve thousand, twenty-one".