21423206162400 has 576 divisors, whose sum is σ = 82464196953600. Its totient is φ = 4729101189120.

The previous prime is 21423206162381. The next prime is 21423206162401. The reversal of 21423206162400 is 426160232412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21423206162401) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 64126996 + ... + 64460204.

It is an arithmetic number, because the mean of its divisors is an integer number (143167008600).

Almost surely, 2^{21423206162400} is an apocalyptic number.

21423206162400 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 21423206162400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41232098476800).

21423206162400 is an abundant number, since it is smaller than the sum of its proper divisors (61040990791200).

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

21423206162400 is a wasteful number, since it uses less digits than its factorization.

21423206162400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333371 (or 333358 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 33.

Adding to 21423206162400 its reverse (426160232412), we get a palindrome (21849366394812).

The spelling of 21423206162400 in words is "twenty-one trillion, four hundred twenty-three billion, two hundred six million, one hundred sixty-two thousand, four hundred".