1011221020121 has 16 divisors (see below), whose sum is σ = 1137496738560. Its totient is φ = 892497372480.

The previous prime is 1011221020067. The next prime is 1011221020127. The reversal of 1011221020121 is 1210201221101.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1011221020121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1011221020096 and 1011221020105.

It is not an unprimeable number, because it can be changed into a prime (1011221020127) 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, 12981965 + ... + 13059626.

It is an arithmetic number, because the mean of its divisors is an integer number (71093546160).

Almost surely, 2^{1011221020121} is an apocalyptic number.

It is an amenable number.

1011221020121 is a deficient number, since it is larger than the sum of its proper divisors (126275718439).

1011221020121 is a wasteful number, since it uses less digits than its factorization.

1011221020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26041736.

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

Adding to 1011221020121 its reverse (1210201221101), we get a palindrome (2221422241222).

The spelling of 1011221020121 in words is "one trillion, eleven billion, two hundred twenty-one million, twenty thousand, one hundred twenty-one".