21250143400 has 192 divisors, whose sum is σ = 53688528000. Its totient is φ = 7794662400.

The previous prime is 21250143391. The next prime is 21250143401. The reversal of 21250143400 is 434105212.

It is not an unprimeable number, because it can be changed into a prime (21250143401) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 50475190 + ... + 50475610.

It is an arithmetic number, because the mean of its divisors is an integer number (279627750).

Almost surely, 2^21250143400 is an apocalyptic number.

21250143400 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 21250143400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26844264000).

21250143400 is an abundant number, since it is smaller than the sum of its proper divisors (32438384600).

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

21250143400 is a wasteful number, since it uses less digits than its factorization.

21250143400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 852 (or 843 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 21250143400 its reverse (434105212), we get a palindrome (21684248612).

The spelling of 21250143400 in words is "twenty-one billion, two hundred fifty million, one hundred forty-three thousand, four hundred".