2213768937681 has 12 divisors (see below), whose sum is σ = 3654475706752. Its totient is φ = 1265010821496.

The previous prime is 2213768937649. The next prime is 2213768937769. The reversal of 2213768937681 is 1867398673122.

2213768937681 is a `hidden beast` number, since 221 + 37 + 6 + 8 + 9 + 376 + 8 + 1 = 666.

It is not a de Polignac number, because 2213768937681 - 2⁵ = 2213768937649 is a prime.

It is a super-2 number, since 2×2213768937681² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63), and also a Moran number because the ratio is a prime number: 35139189487 = 2213768937681 / (2 + 2 + 1 + 3 + 7 + 6 + 8 + 9 + 3 + 7 + 6 + 8 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2213768937181) 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, 17569594681 + ... + 17569594806.

Almost surely, 2^{2213768937681} is an apocalyptic number.

2213768937681 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2213768937681 is a deficient number, since it is larger than the sum of its proper divisors (1440706769071).

2213768937681 is a wasteful number, since it uses less digits than its factorization.

2213768937681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35139189500 (or 35139189497 counting only the distinct ones).

The product of its digits is 36578304, while the sum is 63.

The spelling of 2213768937681 in words is "two trillion, two hundred thirteen billion, seven hundred sixty-eight million, nine hundred thirty-seven thousand, six hundred eighty-one".