102001012121 has 4 divisors (see below), whose sum is σ = 102003728592. Its totient is φ = 101998295652.

The previous prime is 102001012103. The next prime is 102001012301. The reversal of 102001012121 is 121210100201.

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, and also an emirpimes, since its reverse is a distinct semiprime: 121210100201 = 17291 ⋅7010011.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102001012121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102001212121) 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, 1301111 + ... + 1377276.

It is an arithmetic number, because the mean of its divisors is an integer number (25500932148).

Almost surely, 2^102001012121 is an apocalyptic number.

It is an amenable number.

102001012121 is a deficient number, since it is larger than the sum of its proper divisors (2716471).

102001012121 is an equidigital number, since it uses as much as digits as its factorization.

102001012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2716470.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 102001012121 its reverse (121210100201), we get a palindrome (223211112322).

The spelling of 102001012121 in words is "one hundred two billion, one million, twelve thousand, one hundred twenty-one".