121220001001 has 4 divisors (see below), whose sum is σ = 132240001104. Its totient is φ = 110200000900.

The previous prime is 121220000963. The next prime is 121220001011. The reversal of 121220001001 is 100100022121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 121220001001 - 2³¹ = 119072517353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121220001011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5510000035 + ... + 5510000056.

It is an arithmetic number, because the mean of its divisors is an integer number (33060000276).

Almost surely, 2^121220001001 is an apocalyptic number.

121220001001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121220001001 is a deficient number, since it is larger than the sum of its proper divisors (11020000103).

121220001001 is a wasteful number, since it uses less digits than its factorization.

121220001001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11020000102.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 121220001001 its reverse (100100022121), we get a palindrome (221320023122).

The spelling of 121220001001 in words is "one hundred twenty-one billion, two hundred twenty million, one thousand, one".