121312120001021 has 32 divisors (see below), whose sum is σ = 125017836742656. Its totient is φ = 117649909440000.

The previous prime is 121312120000999. The next prime is 121312120001041. The reversal of 121312120001021 is 120100021213121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 121312120001021 - 2²⁶ = 121312052892157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121312120001041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13256701796 + ... + 13256710946.

It is an arithmetic number, because the mean of its divisors is an integer number (3906807398208).

Almost surely, 2^{121312120001021} is an apocalyptic number.

It is an amenable number.

121312120001021 is a deficient number, since it is larger than the sum of its proper divisors (3705716741635).

121312120001021 is a wasteful number, since it uses less digits than its factorization.

121312120001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13253.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 121312120001021 its reverse (120100021213121), we get a palindrome (241412141214142).

The spelling of 121312120001021 in words is "one hundred twenty-one trillion, three hundred twelve billion, one hundred twenty million, one thousand, twenty-one".