121002012021 has 64 divisors (see below), whose sum is σ = 187527453696. Its totient is φ = 68588467200.

The previous prime is 121002011951. The next prime is 121002012037. The reversal of 121002012021 is 120210200121.

It is not a de Polignac number, because 121002012021 - 2¹⁸ = 121001749877 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121002011988 and 121002012006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121002012071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 69261870 + ... + 69263616.

It is an arithmetic number, because the mean of its divisors is an integer number (2930116464).

Almost surely, 2^121002012021 is an apocalyptic number.

121002012021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121002012021 is a deficient number, since it is larger than the sum of its proper divisors (66525441675).

121002012021 is a wasteful number, since it uses less digits than its factorization.

121002012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2482.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 121002012021 its reverse (120210200121), we get a palindrome (241212212142).

The spelling of 121002012021 in words is "one hundred twenty-one billion, two million, twelve thousand, twenty-one".