121220221001 has 16 divisors (see below), whose sum is σ = 135452663808. Its totient is φ = 107528374800.

The previous prime is 121220220991. The next prime is 121220221021. The reversal of 121220221001 is 100122022121.

It is not a de Polignac number, because 121220221001 - 2³⁴ = 104040351817 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121220221021) 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, 339440 + ... + 598046.

It is an arithmetic number, because the mean of its divisors is an integer number (8465791488).

Almost surely, 2^121220221001 is an apocalyptic number.

121220221001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121220221001 is a deficient number, since it is larger than the sum of its proper divisors (14232442807).

121220221001 is a wasteful number, since it uses less digits than its factorization.

121220221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259652.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 121220221001 its reverse (100122022121), we get a palindrome (221342243122).

The spelling of 121220221001 in words is "one hundred twenty-one billion, two hundred twenty million, two hundred twenty-one thousand, one".