121211002001 has 4 divisors (see below), whose sum is σ = 121241746752. Its totient is φ = 121180257252.

The previous prime is 121211001991. The next prime is 121211002051. The reversal of 121211002001 is 100200112121.

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 121211002001 - 2⁶ = 121211001937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121211002051) 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, 15366461 + ... + 15374346.

It is an arithmetic number, because the mean of its divisors is an integer number (30310436688).

Almost surely, 2^121211002001 is an apocalyptic number.

It is an amenable number.

121211002001 is a deficient number, since it is larger than the sum of its proper divisors (30744751).

121211002001 is an equidigital number, since it uses as much as digits as its factorization.

121211002001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30744750.

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

Adding to 121211002001 its reverse (100200112121), we get a palindrome (221411114122).

It can be divided in two parts, 12121 and 1002001, that multiplied together give a palindrome (12145254121).

The spelling of 121211002001 in words is "one hundred twenty-one billion, two hundred eleven million, two thousand, one".