121001011011221 has 16 divisors (see below), whose sum is σ = 138565073461248. Its totient is φ = 104588220884400.

The previous prime is 121001011011187. The next prime is 121001011011229. The reversal of 121001011011221 is 122110110100121.

It is not a de Polignac number, because 121001011011221 - 2⁴² = 116602964500117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121001011011196 and 121001011011205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121001011011229) 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, 1431888485 + ... + 1431972986.

It is an arithmetic number, because the mean of its divisors is an integer number (8660317091328).

Almost surely, 2^{121001011011221} is an apocalyptic number.

121001011011221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121001011011221 is a deficient number, since it is larger than the sum of its proper divisors (17564062450027).

121001011011221 is a wasteful number, since it uses less digits than its factorization.

121001011011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2863861672.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 121001011011221 its reverse (122110110100121), we get a palindrome (243111121111342).

The spelling of 121001011011221 in words is "one hundred twenty-one trillion, one billion, eleven million, eleven thousand, two hundred twenty-one".