21449999946 has 8 divisors (see below), whose sum is σ = 42899999904. Its totient is φ = 7149999980.

The previous prime is 21449999941. The next prime is 21450000001. The reversal of 21449999946 is 64999994412.

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

21449999946 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21449999941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1787499990 + ... + 1787500001.

It is an arithmetic number, because the mean of its divisors is an integer number (5362499988).

Almost surely, 2^21449999946 is an apocalyptic number.

21449999946 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21449999946 is a wasteful number, since it uses less digits than its factorization.

21449999946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3574999996.

The product of its digits is 45349632, while the sum is 66.

The spelling of 21449999946 in words is "twenty-one billion, four hundred forty-nine million, nine hundred ninety-nine thousand, nine hundred forty-six".