21450953786 has 8 divisors (see below), whose sum is σ = 32617203924. Its totient is φ = 10578552480.

The previous prime is 21450953747. The next prime is 21450953789. The reversal of 21450953786 is 68735905412.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21219457561 + 231496225 = 145669^2 + 15215^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21450953789) 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 3 ways as a sum of consecutive naturals, for example, 73462025 + ... + 73462316.

It is a 1-persistent number, because it is pandigital, but 2⋅21450953786 = 42901907572 is not.

Almost surely, 2^21450953786 is an apocalyptic number.

21450953786 is a deficient number, since it is larger than the sum of its proper divisors (11166250138).

21450953786 is a wasteful number, since it uses less digits than its factorization.

21450953786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146924416.

The product of its (nonzero) digits is 1814400, while the sum is 50.

The spelling of 21450953786 in words is "twenty-one billion, four hundred fifty million, nine hundred fifty-three thousand, seven hundred eighty-six".