21649310146 has 8 divisors (see below), whose sum is σ = 32865218064. Its totient is φ = 10694237460.

The previous prime is 21649310141. The next prime is 21649310149. The reversal of 21649310146 is 64101394612.

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

It is not an unprimeable number, because it can be changed into a prime (21649310141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65208600 + ... + 65208931.

It is an arithmetic number, because the mean of its divisors is an integer number (4108152258).

Almost surely, 2^21649310146 is an apocalyptic number.

21649310146 is a deficient number, since it is larger than the sum of its proper divisors (11215907918).

21649310146 is a wasteful number, since it uses less digits than its factorization.

21649310146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130417616.

The product of its (nonzero) digits is 31104, while the sum is 37.

The spelling of 21649310146 in words is "twenty-one billion, six hundred forty-nine million, three hundred ten thousand, one hundred forty-six".