1011221021221 has 4 divisors (see below), whose sum is σ = 1026313872352. Its totient is φ = 996128170092.

The previous prime is 1011221021159. The next prime is 1011221021249. The reversal of 1011221021221 is 1221201221101.

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 1011221021221 - 2⁷ = 1011221021093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1011221021195 and 1011221021204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011221021021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7546425465 + ... + 7546425598.

It is an arithmetic number, because the mean of its divisors is an integer number (256578468088).

Almost surely, 2^{1011221021221} is an apocalyptic number.

It is an amenable number.

1011221021221 is a deficient number, since it is larger than the sum of its proper divisors (15092851131).

1011221021221 is an equidigital number, since it uses as much as digits as its factorization.

1011221021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15092851130.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1011221021221 its reverse (1221201221101), we get a palindrome (2232422242322).

The spelling of 1011221021221 in words is "one trillion, eleven billion, two hundred twenty-one million, twenty-one thousand, two hundred twenty-one".