121020020001 has 10 divisors (see below), whose sum is σ = 180782992962. Its totient is φ = 80680013280.

The previous prime is 121020019993. The next prime is 121020020027. The reversal of 121020020001 is 100020020121.

It can be written as a sum of positive squares in only one way, i.e., 88503275025 + 32516744976 = 297495^2 + 180324^2 .

It is not a de Polignac number, because 121020020001 - 2³ = 121020019993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (121020027001) 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 9 ways as a sum of consecutive naturals, for example, 747037080 + ... + 747037241.

Almost surely, 2^121020020001 is an apocalyptic number.

It is an amenable number.

121020020001 is a deficient number, since it is larger than the sum of its proper divisors (59762972961).

121020020001 is an equidigital number, since it uses as much as digits as its factorization.

121020020001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1494074333 (or 1494074324 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 121020020001 its reverse (100020020121), we get a palindrome (221040040122).

The spelling of 121020020001 in words is "one hundred twenty-one billion, twenty million, twenty thousand, one".