121001002002021 has 4 divisors (see below), whose sum is σ = 161334669336032. Its totient is φ = 80667334668012.

The previous prime is 121001002001987. The next prime is 121001002002079. The reversal of 121001002002021 is 120200200100121.

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 de Polignac number, because none of the positive numbers 2^k-121001002002021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121001002001988 and 121001002002006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121001002001021) 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, 20166833667001 + ... + 20166833667006.

It is an arithmetic number, because the mean of its divisors is an integer number (40333667334008).

Almost surely, 2^{121001002002021} is an apocalyptic number.

It is an amenable number.

121001002002021 is a deficient number, since it is larger than the sum of its proper divisors (40333667334011).

121001002002021 is an equidigital number, since it uses as much as digits as its factorization.

121001002002021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40333667334010.

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

Adding to 121001002002021 its reverse (120200200100121), we get a palindrome (241201202102142).

The spelling of 121001002002021 in words is "one hundred twenty-one trillion, one billion, two million, two thousand, twenty-one".