1221021101011 has 8 divisors (see below), whose sum is σ = 1274260299264. Its totient is φ = 1167794513160.

The previous prime is 1221021100963. The next prime is 1221021101023. The reversal of 1221021101011 is 1101011201221.

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 1221021101011 - 2¹⁹ = 1221020576723 is a prime.

It is a super-2 number, since 2×1221021101011² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221021100982 and 1221021101000.

It is not an unprimeable number, because it can be changed into a prime (1221021101081) 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, 2954461 + ... + 3342286.

It is an arithmetic number, because the mean of its divisors is an integer number (159282537408).

Almost surely, 2^{1221021101011} is an apocalyptic number.

1221021101011 is a deficient number, since it is larger than the sum of its proper divisors (53239198253).

1221021101011 is an equidigital number, since it uses as much as digits as its factorization.

1221021101011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6305201.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1221021101011 its reverse (1101011201221), we get a palindrome (2322032302232).

The spelling of 1221021101011 in words is "one trillion, two hundred twenty-one billion, twenty-one million, one hundred one thousand, eleven".