79121220001 has 2 divisors, whose sum is σ = 79121220002. Its totient is φ = 79121220000.

The previous prime is 79121219959. The next prime is 79121220007. The reversal of 79121220001 is 10002212197.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77034557601 + 2086662400 = 277551^2 + 45680^2 .

It is an emirp because it is prime and its reverse (10002212197) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79121220001 - 2¹⁷ = 79121088929 is a prime.

It is a super-3 number, since 3×79121220001³ (a number of 34 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (79121220007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39560610000 + 39560610001.

It is an arithmetic number, because the mean of its divisors is an integer number (39560610001).

Almost surely, 2^79121220001 is an apocalyptic number.

It is an amenable number.

79121220001 is a deficient number, since it is larger than the sum of its proper divisors (1).

79121220001 is an equidigital number, since it uses as much as digits as its factorization.

79121220001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 25.

Adding to 79121220001 its reverse (10002212197), we get a palindrome (89123432198).

The spelling of 79121220001 in words is "seventy-nine billion, one hundred twenty-one million, two hundred twenty thousand, one".