21643160026 has 8 divisors (see below), whose sum is σ = 32465375424. Its totient is φ = 10821368220.

The previous prime is 21643159999. The next prime is 21643160051. The reversal of 21643160026 is 62006134612.

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

It is a super-2 number, since 2×21643160026² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21643160026.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109311 + ... + 235021.

It is an arithmetic number, because the mean of its divisors is an integer number (4058171928).

Almost surely, 2^21643160026 is an apocalyptic number.

21643160026 is a deficient number, since it is larger than the sum of its proper divisors (10822215398).

21643160026 is a wasteful number, since it uses less digits than its factorization.

21643160026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211796.

The product of its (nonzero) digits is 10368, while the sum is 31.

Adding to 21643160026 its reverse (62006134612), we get a palindrome (83649294638).

The spelling of 21643160026 in words is "twenty-one billion, six hundred forty-three million, one hundred sixty thousand, twenty-six".