1021221012221 has 8 divisors (see below), whose sum is σ = 1043079240960. Its totient is φ = 999368205328.

The previous prime is 1021221012197. The next prime is 1021221012239. The reversal of 1021221012221 is 1222101221201.

1021221012221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 1021221012221 - 2⁶ = 1021221012157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1021221012221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021221012521) 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, 973586 + ... + 1729251.

It is an arithmetic number, because the mean of its divisors is an integer number (130384905120).

Almost surely, 2^{1021221012221} is an apocalyptic number.

It is an amenable number.

1021221012221 is a deficient number, since it is larger than the sum of its proper divisors (21858228739).

1021221012221 is an equidigital number, since it uses as much as digits as its factorization.

1021221012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2710923.

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

Adding to 1021221012221 its reverse (1222101221201), we get a palindrome (2243322233422).

The spelling of 1021221012221 in words is "one trillion, twenty-one billion, two hundred twenty-one million, twelve thousand, two hundred twenty-one".