1212110719681 has 9 divisors (see below), whose sum is σ = 1223057821219. Its totient is φ = 1201260768736.

The previous prime is 1212110719597. The next prime is 1212110719691. The reversal of 1212110719681 is 1869170112121.

The square root of 1212110719681 is 1100959.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 21358361025 + 1190752358656 = 146145^2 + 1091216^2 .

It is not a de Polignac number, because 1212110719681 - 2¹³ = 1212110711489 is a prime.

It is a super-2 number, since 2×1212110719681² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212110719691) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 124403496 + ... + 124413238.

Almost surely, 2^{1212110719681} is an apocalyptic number.

1212110719681 is the 1100959-th square number.

1212110719681 is the 550480-th centered octagonal number.

It is an amenable number.

1212110719681 is a deficient number, since it is larger than the sum of its proper divisors (10947101538).

1212110719681 is an frugal number, since it uses more digits than its factorization.

1212110719681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19712 (or 9856 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 40.

The spelling of 1212110719681 in words is "one trillion, two hundred twelve billion, one hundred ten million, seven hundred nineteen thousand, six hundred eighty-one".