21420563595 has 16 divisors (see below), whose sum is σ = 34323098112. Its totient is φ = 11407568480.

The previous prime is 21420563569. The next prime is 21420563603. The reversal of 21420563595 is 59536502412.

It is a happy number.

It is not a de Polignac number, because 21420563595 - 2⁶ = 21420563531 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1035171 + ... + 1055660.

It is an arithmetic number, because the mean of its divisors is an integer number (2145193632).

Almost surely, 2^21420563595 is an apocalyptic number.

21420563595 is a deficient number, since it is larger than the sum of its proper divisors (12902534517).

21420563595 is a wasteful number, since it uses less digits than its factorization.

21420563595 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2091522.

The product of its (nonzero) digits is 324000, while the sum is 42.

The spelling of 21420563595 in words is "twenty-one billion, four hundred twenty million, five hundred sixty-three thousand, five hundred ninety-five".