1221212012021 has 8 divisors (see below), whose sum is σ = 1242884832000. Its totient is φ = 1199694553200.

The previous prime is 1221212011997. The next prime is 1221212012039. The reversal of 1221212012021 is 1202102121221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221212012021 - 2²² = 1221207817717 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221212014021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38824430 + ... + 38855871.

It is an arithmetic number, because the mean of its divisors is an integer number (155360604000).

Almost surely, 2^{1221212012021} is an apocalyptic number.

It is an amenable number.

1221212012021 is a deficient number, since it is larger than the sum of its proper divisors (21672819979).

1221212012021 is an equidigital number, since it uses as much as digits as its factorization.

1221212012021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77680579.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1221212012021 its reverse (1202102121221), we get a palindrome (2423314133242).

The spelling of 1221212012021 in words is "one trillion, two hundred twenty-one billion, two hundred twelve million, twelve thousand, twenty-one".