21906682988463 has 72 divisors (see below), whose sum is σ = 39162217960320. Its totient is φ = 11554282584000.

The previous prime is 21906682988461. The next prime is 21906682988483. The reversal of 21906682988463 is 36488928660912.

It is a happy number.

21906682988463 is a `hidden beast` number, since 2 + 1 + 9 + 0 + 6 + 6 + 82 + 9 + 88 + 463 = 666.

It is not a de Polignac number, because 21906682988463 - 2¹ = 21906682988461 is a prime.

It is a super-2 number, since 2×21906682988463² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21906682988391 and 21906682988400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21906682988461) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 151658208 + ... + 151802586.

Almost surely, 2^{21906682988463} is an apocalyptic number.

21906682988463 is a deficient number, since it is larger than the sum of its proper divisors (17255534971857).

21906682988463 is a wasteful number, since it uses less digits than its factorization.

21906682988463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158669 (or 158653 counting only the distinct ones).

The product of its (nonzero) digits is 429981696, while the sum is 72.

The spelling of 21906682988463 in words is "twenty-one trillion, nine hundred six billion, six hundred eighty-two million, nine hundred eighty-eight thousand, four hundred sixty-three".