21146442663 has 8 divisors (see below), whose sum is σ = 28196276976. Its totient is φ = 14097118400.

The previous prime is 21146442661. The next prime is 21146442727. The reversal of 21146442663 is 36624464112.

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 21146442663 - 2¹ = 21146442661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21146442661) 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, 17118 + ... + 206363.

It is an arithmetic number, because the mean of its divisors is an integer number (3524534622).

Almost surely, 2^21146442663 is an apocalyptic number.

21146442663 is a deficient number, since it is larger than the sum of its proper divisors (7049834313).

21146442663 is a wasteful number, since it uses less digits than its factorization.

21146442663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255025.

The product of its digits is 165888, while the sum is 39.

The spelling of 21146442663 in words is "twenty-one billion, one hundred forty-six million, four hundred forty-two thousand, six hundred sixty-three".