21606350546 has 16 divisors (see below), whose sum is σ = 35668734048. Its totient is φ = 9734155200.

The previous prime is 21606350543. The next prime is 21606350573. The reversal of 21606350546 is 64505360612.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21606350543) 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, 4343120 + ... + 4348091.

It is an arithmetic number, because the mean of its divisors is an integer number (2229295878).

Almost surely, 2^21606350546 is an apocalyptic number.

21606350546 is a deficient number, since it is larger than the sum of its proper divisors (14062383502).

21606350546 is a wasteful number, since it uses less digits than its factorization.

21606350546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8691337.

The product of its (nonzero) digits is 129600, while the sum is 38.

The spelling of 21606350546 in words is "twenty-one billion, six hundred six million, three hundred fifty thousand, five hundred forty-six".