21839373400 has 96 divisors (see below), whose sum is σ = 54812116800. Its totient is φ = 8044646400.

The previous prime is 21839373377. The next prime is 21839373401. The reversal of 21839373400 is 437393812.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21839373401) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1110856 + ... + 1130344.

It is an arithmetic number, because the mean of its divisors is an integer number (570959550).

Almost surely, 2^21839373400 is an apocalyptic number.

21839373400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21839373400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27406058400).

21839373400 is an abundant number, since it is smaller than the sum of its proper divisors (32972743400).

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

21839373400 is a wasteful number, since it uses less digits than its factorization.

21839373400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19949 (or 19940 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 40.

The spelling of 21839373400 in words is "twenty-one billion, eight hundred thirty-nine million, three hundred seventy-three thousand, four hundred".