21400207559 has 8 divisors (see below), whose sum is σ = 21491572848. Its totient is φ = 21308944320.

The previous prime is 21400207531. The next prime is 21400207589. The reversal of 21400207559 is 95570200412.

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

It is a cyclic number.

It is not a de Polignac number, because 21400207559 - 2¹² = 21400203463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21400207589) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 410579 + ... + 459755.

It is an arithmetic number, because the mean of its divisors is an integer number (2686446606).

Almost surely, 2^21400207559 is an apocalyptic number.

21400207559 is a deficient number, since it is larger than the sum of its proper divisors (91365289).

21400207559 is a wasteful number, since it uses less digits than its factorization.

21400207559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51025.

The product of its (nonzero) digits is 25200, while the sum is 35.

The spelling of 21400207559 in words is "twenty-one billion, four hundred million, two hundred seven thousand, five hundred fifty-nine".