21106511463 has 8 divisors (see below), whose sum is σ = 28145483776. Its totient is φ = 14069273400.

The previous prime is 21106511443. The next prime is 21106511473. The reversal of 21106511463 is 36411560112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21106511463 - 2⁸ = 21106511207 is a prime.

It is a super-2 number, since 2×21106511463² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21106511463.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21106511423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 404893 + ... + 454038.

It is an arithmetic number, because the mean of its divisors is an integer number (3518185472).

Almost surely, 2^21106511463 is an apocalyptic number.

21106511463 is a deficient number, since it is larger than the sum of its proper divisors (7038972313).

21106511463 is an equidigital number, since it uses as much as digits as its factorization.

21106511463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 867125.

The product of its (nonzero) digits is 4320, while the sum is 30.

The spelling of 21106511463 in words is "twenty-one billion, one hundred six million, five hundred eleven thousand, four hundred sixty-three".