1020002122121 has 4 divisors (see below), whose sum is σ = 1020005817600. Its totient is φ = 1019998426644.

The previous prime is 1020002122103. The next prime is 1020002122129. The reversal of 1020002122121 is 1212212000201.

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 cyclic number.

It is not a de Polignac number, because 1020002122121 - 2¹⁴ = 1020002105737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020002122096 and 1020002122105.

It is not an unprimeable number, because it can be changed into a prime (1020002122129) 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, 1397081 + ... + 1997958.

It is an arithmetic number, because the mean of its divisors is an integer number (255001454400).

Almost surely, 2^{1020002122121} is an apocalyptic number.

It is an amenable number.

1020002122121 is a deficient number, since it is larger than the sum of its proper divisors (3695479).

1020002122121 is an equidigital number, since it uses as much as digits as its factorization.

1020002122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3695478.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1020002122121 its reverse (1212212000201), we get a palindrome (2232214122322).

The spelling of 1020002122121 in words is "one trillion, twenty billion, two million, one hundred twenty-two thousand, one hundred twenty-one".