21416125400 has 48 divisors (see below), whose sum is σ = 51138252240. Its totient is φ = 8334921600.

The previous prime is 21416125397. The next prime is 21416125427. The reversal of 21416125400 is 452161412.

It is a self number, because there is not a number n which added to its sum of digits gives 21416125400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1439636 + ... + 1454435.

It is an arithmetic number, because the mean of its divisors is an integer number (1065380255).

Almost surely, 2^21416125400 is an apocalyptic number.

21416125400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21416125400 is an abundant number, since it is smaller than the sum of its proper divisors (29722126840).

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

21416125400 is a wasteful number, since it uses less digits than its factorization.

21416125400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2894124 (or 2894115 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

Adding to 21416125400 its reverse (452161412), we get a palindrome (21868286812).

The spelling of 21416125400 in words is "twenty-one billion, four hundred sixteen million, one hundred twenty-five thousand, four hundred".