21370356563 has 8 divisors (see below), whose sum is σ = 22112984880. Its totient is φ = 20628109600.

The previous prime is 21370356523. The next prime is 21370356587. The reversal of 21370356563 is 36565307312.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21370356563 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21370356563.

It is not an unprimeable number, because it can be changed into a prime (21370356503) 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 7 ways as a sum of consecutive naturals, for example, 21113 + ... + 207813.

It is an arithmetic number, because the mean of its divisors is an integer number (2764123110).

Almost surely, 2^21370356563 is an apocalyptic number.

21370356563 is a deficient number, since it is larger than the sum of its proper divisors (742628317).

21370356563 is a wasteful number, since it uses less digits than its factorization.

21370356563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190677.

The product of its (nonzero) digits is 340200, while the sum is 41.

The spelling of 21370356563 in words is "twenty-one billion, three hundred seventy million, three hundred fifty-six thousand, five hundred sixty-three".