121020001 has 4 divisors (see below), whose sum is σ = 124923904. Its totient is φ = 117116100.

The previous prime is 121019999. The next prime is 121020019. The reversal of 121020001 is 100020121.

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 121020001 - 2¹ = 121019999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121020061) 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, 1951905 + ... + 1951966.

It is an arithmetic number, because the mean of its divisors is an integer number (31230976).

Almost surely, 2^121020001 is an apocalyptic number.

It is an amenable number.

121020001 is a deficient number, since it is larger than the sum of its proper divisors (3903903).

121020001 is an equidigital number, since it uses as much as digits as its factorization.

121020001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3903902.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 121020001 is about 11000.9090987972. The cubic root of 121020001 is about 494.6359953565.

Adding to 121020001 its reverse (100020121), we get a palindrome (221040122).

The spelling of 121020001 in words is "one hundred twenty-one million, twenty thousand, one".