21420701593 has 16 divisors (see below), whose sum is σ = 23507858880. Its totient is φ = 19447331904.

The previous prime is 21420701591. The next prime is 21420701629. The reversal of 21420701593 is 39510702412.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21420701593 - 2¹ = 21420701591 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21420701591) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 204046 + ... + 290647.

It is an arithmetic number, because the mean of its divisors is an integer number (1469241180).

Almost surely, 2^21420701593 is an apocalyptic number.

It is an amenable number.

21420701593 is a deficient number, since it is larger than the sum of its proper divisors (2087157287).

21420701593 is a wasteful number, since it uses less digits than its factorization.

21420701593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494808.

The product of its (nonzero) digits is 15120, while the sum is 34.

The spelling of 21420701593 in words is "twenty-one billion, four hundred twenty million, seven hundred one thousand, five hundred ninety-three".