21420005361 has 8 divisors (see below), whose sum is σ = 28842779904. Its totient is φ = 14138617200.

The previous prime is 21420005353. The next prime is 21420005377. The reversal of 21420005361 is 16350002412.

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

It is not a de Polignac number, because 21420005361 - 2³ = 21420005353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21420005311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35346241 + ... + 35346846.

It is an arithmetic number, because the mean of its divisors is an integer number (3605347488).

Almost surely, 2^21420005361 is an apocalyptic number.

It is an amenable number.

21420005361 is a deficient number, since it is larger than the sum of its proper divisors (7422774543).

21420005361 is a wasteful number, since it uses less digits than its factorization.

21420005361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70693191.

The product of its (nonzero) digits is 1440, while the sum is 24.

Adding to 21420005361 its reverse (16350002412), we get a palindrome (37770007773).

The spelling of 21420005361 in words is "twenty-one billion, four hundred twenty million, five thousand, three hundred sixty-one".