121020021001 has 8 divisors (see below), whose sum is σ = 132048566208. Its totient is φ = 109995930000.

The previous prime is 121020020969. The next prime is 121020021041. The reversal of 121020021001 is 100120020121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121020021001 - 2⁵ = 121020020969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121020021041) 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 7 ways as a sum of consecutive naturals, for example, 1056610 + ... + 1165531.

It is an arithmetic number, because the mean of its divisors is an integer number (16506070776).

Almost surely, 2^121020021001 is an apocalyptic number.

121020021001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121020021001 is a deficient number, since it is larger than the sum of its proper divisors (11028545207).

121020021001 is a wasteful number, since it uses less digits than its factorization.

121020021001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2227103.

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

Adding to 121020021001 its reverse (100120020121), we get a palindrome (221140041122).

The spelling of 121020021001 in words is "one hundred twenty-one billion, twenty million, twenty-one thousand, one".