7801012212101 has 4 divisors (see below), whose sum is σ = 7801034646252. Its totient is φ = 7800989777952.

The previous prime is 7801012212067. The next prime is 7801012212107. The reversal of 7801012212101 is 1012122101087.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7236094620001 + 564917592100 = 2689999^2 + 751610^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7801012212101 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 (7801012212107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10687136 + ... + 11393721.

It is an arithmetic number, because the mean of its divisors is an integer number (1950258661563).

Almost surely, 2^{7801012212101} is an apocalyptic number.

It is an amenable number.

7801012212101 is a deficient number, since it is larger than the sum of its proper divisors (22434151).

7801012212101 is a wasteful number, since it uses less digits than its factorization.

7801012212101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22434150.

The product of its (nonzero) digits is 448, while the sum is 26.

Adding to 7801012212101 its reverse (1012122101087), we get a palindrome (8813134313188).

The spelling of 7801012212101 in words is "seven trillion, eight hundred one billion, twelve million, two hundred twelve thousand, one hundred one".