1301211212121 has 24 divisors (see below), whose sum is σ = 1963783313856. Its totient is φ = 828684347040.

The previous prime is 1301211212117. The next prime is 1301211212149. The reversal of 1301211212121 is 1212121121031.

It is a happy number.

It is not a de Polignac number, because 1301211212121 - 2² = 1301211212117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1301211212094 and 1301211212103.

It is not an unprimeable number, because it can be changed into a prime (1301211210121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3905995 + ... + 4226016.

It is an arithmetic number, because the mean of its divisors is an integer number (81824304744).

Almost surely, 2^{1301211212121} is an apocalyptic number.

It is an amenable number.

1301211212121 is a deficient number, since it is larger than the sum of its proper divisors (662572101735).

1301211212121 is a wasteful number, since it uses less digits than its factorization.

1301211212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8132813 (or 8132810 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 1301211212121 its reverse (1212121121031), we get a palindrome (2513332333152).

The spelling of 1301211212121 in words is "one trillion, three hundred one billion, two hundred eleven million, two hundred twelve thousand, one hundred twenty-one".