121231213001 has 2 divisors, whose sum is σ = 121231213002. Its totient is φ = 121231213000.

The previous prime is 121231212979. The next prime is 121231213031. The reversal of 121231213001 is 100312132121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 92978645776 + 28252567225 = 304924^2 + 168085^2 .

It is an emirp because it is prime and its reverse (100312132121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121231213001 is a prime.

It is not a weakly prime, because it can be changed into another prime (121231213031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60615606500 + 60615606501.

It is an arithmetic number, because the mean of its divisors is an integer number (60615606501).

Almost surely, 2^121231213001 is an apocalyptic number.

It is an amenable number.

121231213001 is a deficient number, since it is larger than the sum of its proper divisors (1).

121231213001 is an equidigital number, since it uses as much as digits as its factorization.

121231213001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 121231213001 its reverse (100312132121), we get a palindrome (221543345122).

The spelling of 121231213001 in words is "one hundred twenty-one billion, two hundred thirty-one million, two hundred thirteen thousand, one".