21395424704 has 14 divisors (see below), whose sum is σ = 42456546024. Its totient is φ = 10697712320.

The previous prime is 21395424667. The next prime is 21395424709. The reversal of 21395424704 is 40742459312.

It is a super-3 number, since 3×21395424704³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21395424709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167151692 + ... + 167151819.

Almost surely, 2^21395424704 is an apocalyptic number.

It is an amenable number.

21395424704 is a deficient number, since it is larger than the sum of its proper divisors (21061121320).

21395424704 is an equidigital number, since it uses as much as digits as its factorization.

21395424704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334303523 (or 334303513 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 41.

The spelling of 21395424704 in words is "twenty-one billion, three hundred ninety-five million, four hundred twenty-four thousand, seven hundred four".