10213868781 has 12 divisors (see below), whose sum is σ = 14765544508. Its totient is φ = 6803625024.

The previous prime is 10213868761. The next prime is 10213868807. The reversal of 10213868781 is 18786831201.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1945603881 + 8268264900 = 44109^2 + 90930^2 .

It is not a de Polignac number, because 10213868781 - 2³³ = 1623934189 is a prime.

It is a super-2 number, since 2×10213868781² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10213868711) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 456880 + ... + 478713.

Almost surely, 2^10213868781 is an apocalyptic number.

It is an amenable number.

10213868781 is a deficient number, since it is larger than the sum of its proper divisors (4551675727).

10213868781 is a wasteful number, since it uses less digits than its factorization.

10213868781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 936812 (or 936809 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 45.

The spelling of 10213868781 in words is "ten billion, two hundred thirteen million, eight hundred sixty-eight thousand, seven hundred eighty-one".