21444551004 has 24 divisors (see below), whose sum is σ = 51762710160. Its totient is φ = 6901694464.

The previous prime is 21444550997. The next prime is 21444551017. The reversal of 21444551004 is 40015544412.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30810789 + ... + 30811484.

It is an arithmetic number, because the mean of its divisors is an integer number (2156779590).

Almost surely, 2^21444551004 is an apocalyptic number.

It is an amenable number.

21444551004 is an abundant number, since it is smaller than the sum of its proper divisors (30318159156).

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

21444551004 is a wasteful number, since it uses less digits than its factorization.

21444551004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61622309 (or 61622307 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 30.

The spelling of 21444551004 in words is "twenty-one billion, four hundred forty-four million, five hundred fifty-one thousand, four".