21083084400 has 120 divisors (see below), whose sum is σ = 77184198784. Its totient is φ = 4818988800.

The previous prime is 21083084383. The next prime is 21083084447. The reversal of 21083084400 is 448038012.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1246546 + ... + 1263345.

Almost surely, 2^21083084400 is an apocalyptic number.

21083084400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21083084400 is an abundant number, since it is smaller than the sum of its proper divisors (56101114384).

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

21083084400 is a wasteful number, since it uses less digits than its factorization.

21083084400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2509919 (or 2509908 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 30.

The spelling of 21083084400 in words is "twenty-one billion, eighty-three million, eighty-four thousand, four hundred".