121012002021 has 16 divisors (see below), whose sum is σ = 161855902208. Its totient is φ = 80421778800.

The previous prime is 121012001989. The next prime is 121012002029. The reversal of 121012002021 is 120200210121.

It is not a de Polignac number, because 121012002021 - 2⁵ = 121012001989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 121012001988 and 121012002006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121012002029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1196766 + ... + 1293936.

It is an arithmetic number, because the mean of its divisors is an integer number (10115993888).

Almost surely, 2^121012002021 is an apocalyptic number.

It is an amenable number.

121012002021 is a deficient number, since it is larger than the sum of its proper divisors (40843900187).

121012002021 is an equidigital number, since it uses as much as digits as its factorization.

121012002021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98472.

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

Adding to 121012002021 its reverse (120200210121), we get a palindrome (241212212142).

The spelling of 121012002021 in words is "one hundred twenty-one billion, twelve million, two thousand, twenty-one".