1021021221101 has 16 divisors (see below), whose sum is σ = 1196023309440. Its totient is φ = 853563268800.

The previous prime is 1021021221079. The next prime is 1021021221107. The reversal of 1021021221101 is 1011221201201.

It is a cyclic number.

It is not a de Polignac number, because 1021021221101 - 2¹⁸ = 1021020958957 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 (1021021221107) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10729946 + ... + 10824683.

It is an arithmetic number, because the mean of its divisors is an integer number (74751456840).

Almost surely, 2^{1021021221101} is an apocalyptic number.

It is an amenable number.

1021021221101 is a deficient number, since it is larger than the sum of its proper divisors (175002088339).

1021021221101 is a wasteful number, since it uses less digits than its factorization.

1021021221101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21554804.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1021021221101 its reverse (1011221201201), we get a palindrome (2032242422302).

The spelling of 1021021221101 in words is "one trillion, twenty-one billion, twenty-one million, two hundred twenty-one thousand, one hundred one".