21421101044 has 24 divisors (see below), whose sum is σ = 42858285120. Its totient is φ = 9177025536.

The previous prime is 21421101043. The next prime is 21421101059. The reversal of 21421101044 is 44010112412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21421101043) 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, 66962 + ... + 217545.

It is an arithmetic number, because the mean of its divisors is an integer number (1785761880).

Almost surely, 2^21421101044 is an apocalyptic number.

It is an amenable number.

21421101044 is an abundant number, since it is smaller than the sum of its proper divisors (21437184076).

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

21421101044 is a wasteful number, since it uses less digits than its factorization.

21421101044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287207 (or 287205 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21421101044 its reverse (44010112412), we get a palindrome (65431213456).

The spelling of 21421101044 in words is "twenty-one billion, four hundred twenty-one million, one hundred one thousand, forty-four".