21041420063 has 4 divisors (see below), whose sum is σ = 21329658768. Its totient is φ = 20753181360.

The previous prime is 21041420053. The next prime is 21041420087. The reversal of 21041420063 is 36002414012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21041420063 - 2¹⁶ = 21041354527 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 (21041420033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144119243 + ... + 144119388.

It is an arithmetic number, because the mean of its divisors is an integer number (5332414692).

Almost surely, 2^21041420063 is an apocalyptic number.

21041420063 is a deficient number, since it is larger than the sum of its proper divisors (288238705).

21041420063 is an equidigital number, since it uses as much as digits as its factorization.

21041420063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288238704.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21041420063 its reverse (36002414012), we get a palindrome (57043834075).

The spelling of 21041420063 in words is "twenty-one billion, forty-one million, four hundred twenty thousand, sixty-three".