21606346443 has 16 divisors (see below), whose sum is σ = 31432611456. Its totient is φ = 13092589440.

The previous prime is 21606346417. The next prime is 21606346457. The reversal of 21606346443 is 34464360612.

It is not a de Polignac number, because 21606346443 - 2³² = 17311379147 is a prime.

It is a super-2 number, since 2×21606346443² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21606346243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 161155 + ... + 263027.

It is an arithmetic number, because the mean of its divisors is an integer number (1964538216).

Almost surely, 2^21606346443 is an apocalyptic number.

21606346443 is a deficient number, since it is larger than the sum of its proper divisors (9826265013).

21606346443 is a wasteful number, since it uses less digits than its factorization.

21606346443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108314.

The product of its (nonzero) digits is 248832, while the sum is 39.

The spelling of 21606346443 in words is "twenty-one billion, six hundred six million, three hundred forty-six thousand, four hundred forty-three".