7801212121112 has 16 divisors (see below), whose sum is σ = 14627302544400. Its totient is φ = 3900598109280.

The previous prime is 7801212121097. The next prime is 7801212121127. The reversal of 7801212121112 is 2111212121087.

It is an interprime number because it is at equal distance from previous prime (7801212121097) and next prime (7801212121127).

It is a super-2 number, since 2×7801212121112² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6496214 + ... + 7602842.

It is an arithmetic number, because the mean of its divisors is an integer number (914206409025).

Almost surely, 2^{7801212121112} is an apocalyptic number.

It is an amenable number.

7801212121112 is a deficient number, since it is larger than the sum of its proper divisors (6826090423288).

7801212121112 is a wasteful number, since it uses less digits than its factorization.

7801212121112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1987826 (or 1987822 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 29.

Adding to 7801212121112 its reverse (2111212121087), we get a palindrome (9912424242199).

The spelling of 7801212121112 in words is "seven trillion, eight hundred one billion, two hundred twelve million, one hundred twenty-one thousand, one hundred twelve".