21083571444 has 24 divisors (see below), whose sum is σ = 52979231200. Its totient is φ = 6487252704.

The previous prime is 21083571419. The next prime is 21083571463. The reversal of 21083571444 is 44417538012.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67575394 + ... + 67575705.

Almost surely, 2^21083571444 is an apocalyptic number.

It is an amenable number.

21083571444 is an abundant number, since it is smaller than the sum of its proper divisors (31895659756).

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

21083571444 is a wasteful number, since it uses less digits than its factorization.

21083571444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135151119 (or 135151117 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 39.

The spelling of 21083571444 in words is "twenty-one billion, eighty-three million, five hundred seventy-one thousand, four hundred forty-four".