121220213012311 has 4 divisors (see below), whose sum is σ = 138537386299792. Its totient is φ = 103903039724832.

The previous prime is 121220213012303. The next prime is 121220213012347. The reversal of 121220213012311 is 113210312022121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121220213012311 - 2³ = 121220213012303 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 (121220213015311) 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, 8658586643730 + ... + 8658586643743.

It is an arithmetic number, because the mean of its divisors is an integer number (34634346574948).

Almost surely, 2^{121220213012311} is an apocalyptic number.

121220213012311 is a deficient number, since it is larger than the sum of its proper divisors (17317173287481).

121220213012311 is an equidigital number, since it uses as much as digits as its factorization.

121220213012311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17317173287480.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 121220213012311 its reverse (113210312022121), we get a palindrome (234430525034432).

The spelling of 121220213012311 in words is "one hundred twenty-one trillion, two hundred twenty billion, two hundred thirteen million, twelve thousand, three hundred eleven".