78120122210201 has 4 divisors (see below), whose sum is σ = 78120139976400. Its totient is φ = 78120104444004.

The previous prime is 78120122210183. The next prime is 78120122210203. The reversal of 78120122210201 is 10201222102187.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 78120122210201 - 2⁴⁶ = 7751378032537 is a prime.

It is a super-2 number, since 2×78120122210201² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78120122210203) 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, 3108890 + ... + 12880428.

It is an arithmetic number, because the mean of its divisors is an integer number (19530034994100).

Almost surely, 2^{78120122210201} is an apocalyptic number.

It is an amenable number.

78120122210201 is a deficient number, since it is larger than the sum of its proper divisors (17766199).

78120122210201 is an equidigital number, since it uses as much as digits as its factorization.

78120122210201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17766198.

The product of its (nonzero) digits is 1792, while the sum is 29.

Adding to 78120122210201 its reverse (10201222102187), we get a palindrome (88321344312388).

The spelling of 78120122210201 in words is "seventy-eight trillion, one hundred twenty billion, one hundred twenty-two million, two hundred ten thousand, two hundred one".