121221020222011 has 4 divisors (see below), whose sum is σ = 121221068207400. Its totient is φ = 121220972236624.

The previous prime is 121221020221999. The next prime is 121221020222053. The reversal of 121221020222011 is 110222020122121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121221020222011 - 2¹³ = 121221020213819 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121221020222011.

It is not an unprimeable number, because it can be changed into a prime (121221020222311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19979641 + ... + 25330378.

It is an arithmetic number, because the mean of its divisors is an integer number (30305267051850).

Almost surely, 2^{121221020222011} is an apocalyptic number.

121221020222011 is a deficient number, since it is larger than the sum of its proper divisors (47985389).

121221020222011 is an equidigital number, since it uses as much as digits as its factorization.

121221020222011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47985388.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 121221020222011 its reverse (110222020122121), we get a palindrome (231443040344132).

The spelling of 121221020222011 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, twenty million, two hundred twenty-two thousand, eleven".