21442903964 has 24 divisors (see below), whose sum is σ = 39907501200. Its totient is φ = 10046318336.

The previous prime is 21442903961. The next prime is 21442904017. The reversal of 21442903964 is 46930924412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21442903961) 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, 679139 + ... + 710010.

It is an arithmetic number, because the mean of its divisors is an integer number (1662812550).

Almost surely, 2^21442903964 is an apocalyptic number.

It is an amenable number.

21442903964 is a deficient number, since it is larger than the sum of its proper divisors (18464597236).

21442903964 is a wasteful number, since it uses less digits than its factorization.

21442903964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1389397 (or 1389395 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 44.

The spelling of 21442903964 in words is "twenty-one billion, four hundred forty-two million, nine hundred three thousand, nine hundred sixty-four".