1212021020221 has 8 divisors (see below), whose sum is σ = 1335295886688. Its totient is φ = 1090928010000.

The previous prime is 1212021020167. The next prime is 1212021020237. The reversal of 1212021020221 is 1220201202121.

It is a happy number.

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 1212021020221 - 2²⁷ = 1211886802493 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212021020195 and 1212021020204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212021020251) 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, 545462895 + ... + 545465116.

It is an arithmetic number, because the mean of its divisors is an integer number (166911985836).

Almost surely, 2^{1212021020221} is an apocalyptic number.

1212021020221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1212021020221 is a deficient number, since it is larger than the sum of its proper divisors (123274866467).

1212021020221 is a wasteful number, since it uses less digits than its factorization.

1212021020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1090928123.

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

Adding to 1212021020221 its reverse (1220201202121), we get a palindrome (2432222222342).

The spelling of 1212021020221 in words is "one trillion, two hundred twelve billion, twenty-one million, twenty thousand, two hundred twenty-one".