21446501608 has 32 divisors (see below), whose sum is σ = 45965592000. Its totient is φ = 9189597312.

The previous prime is 21446501603. The next prime is 21446501621. The reversal of 21446501608 is 80610564412.

It is not an unprimeable number, because it can be changed into a prime (21446501603) 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, 282943 + ... + 350641.

It is an arithmetic number, because the mean of its divisors is an integer number (1436424750).

Almost surely, 2^21446501608 is an apocalyptic number.

21446501608 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21446501608 is an abundant number, since it is smaller than the sum of its proper divisors (24519090392).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21446501608 is a wasteful number, since it uses less digits than its factorization.

21446501608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73369 (or 73365 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 37.

The spelling of 21446501608 in words is "twenty-one billion, four hundred forty-six million, five hundred one thousand, six hundred eight".