21447206432 has 12 divisors (see below), whose sum is σ = 42224187726. Its totient is φ = 10723603200.

The previous prime is 21447206419. The next prime is 21447206461. The reversal of 21447206432 is 23460274412.

It can be written as a sum of positive squares in only one way, i.e., 12967743376 + 8479463056 = 113876^2 + 92084^2 .

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21447206392 and 21447206401.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335112569 + ... + 335112632.

Almost surely, 2^21447206432 is an apocalyptic number.

It is an amenable number.

21447206432 is a deficient number, since it is larger than the sum of its proper divisors (20776981294).

21447206432 is an equidigital number, since it uses as much as digits as its factorization.

21447206432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670225211 (or 670225203 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 35.

The spelling of 21447206432 in words is "twenty-one billion, four hundred forty-seven million, two hundred six thousand, four hundred thirty-two".