121221001 has 4 divisors (see below), whose sum is σ = 132241104. Its totient is φ = 110200900.

The previous prime is 121220993. The next prime is 121221013. The reversal of 121221001 is 100122121.

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 a cyclic number.

It is not a de Polignac number, because 121221001 - 2³ = 121220993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121221031) 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, 5510035 + ... + 5510056.

It is an arithmetic number, because the mean of its divisors is an integer number (33060276).

Almost surely, 2^121221001 is an apocalyptic number.

121221001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121221001 is a deficient number, since it is larger than the sum of its proper divisors (11020103).

121221001 is a wasteful number, since it uses less digits than its factorization.

121221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11020102.

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

The square root of 121221001 is about 11010.0409172718. The cubic root of 121221001 is about 494.9096879756.

Adding to 121221001 its reverse (100122121), we get a palindrome (221343122).

It can be divided in two parts, 121 and 221001, that added together give a palindrome (221122).

The spelling of 121221001 in words is "one hundred twenty-one million, two hundred twenty-one thousand, one".