21143564063 has 8 divisors (see below), whose sum is σ = 21751655328. Its totient is φ = 20543219424.

The previous prime is 21143564041. The next prime is 21143564069. The reversal of 21143564063 is 36046534112.

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 21143564063 - 2¹² = 21143559967 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 (21143564069) 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, 1931120 + ... + 1942037.

It is an arithmetic number, because the mean of its divisors is an integer number (2718956916).

Almost surely, 2^21143564063 is an apocalyptic number.

21143564063 is a deficient number, since it is larger than the sum of its proper divisors (608091265).

21143564063 is a wasteful number, since it uses less digits than its factorization.

21143564063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3873313.

The product of its (nonzero) digits is 51840, while the sum is 35.

The spelling of 21143564063 in words is "twenty-one billion, one hundred forty-three million, five hundred sixty-four thousand, sixty-three".