1021220312221 has 8 divisors (see below), whose sum is σ = 1022391051264. Its totient is φ = 1020050218320.

The previous prime is 1021220312153. The next prime is 1021220312249. The reversal of 1021220312221 is 1222130221201.

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 1021220312221 - 2²⁷ = 1021086094493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021220312821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3042756 + ... + 3361666.

It is an arithmetic number, because the mean of its divisors is an integer number (127798881408).

Almost surely, 2^{1021220312221} is an apocalyptic number.

It is an amenable number.

1021220312221 is a deficient number, since it is larger than the sum of its proper divisors (1170739043).

1021220312221 is a wasteful number, since it uses less digits than its factorization.

1021220312221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322571.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 1021220312221 its reverse (1222130221201), we get a palindrome (2243350533422).

The spelling of 1021220312221 in words is "one trillion, twenty-one billion, two hundred twenty million, three hundred twelve thousand, two hundred twenty-one".