121211212001 has 4 divisors (see below), whose sum is σ = 132230413104. Its totient is φ = 110192010900.

The previous prime is 121211211997. The next prime is 121211212051. The reversal of 121211212001 is 100212112121.

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 121211212001 - 2² = 121211211997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121211212051) 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, 5509600535 + ... + 5509600556.

It is an arithmetic number, because the mean of its divisors is an integer number (33057603276).

Almost surely, 2^121211212001 is an apocalyptic number.

121211212001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121211212001 is a deficient number, since it is larger than the sum of its proper divisors (11019201103).

121211212001 is a wasteful number, since it uses less digits than its factorization.

121211212001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11019201102.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 121211212001 its reverse (100212112121), we get a palindrome (221423324122).

The spelling of 121211212001 in words is "one hundred twenty-one billion, two hundred eleven million, two hundred twelve thousand, one".