21144113400 has 48 divisors (see below), whose sum is σ = 65546753400. Its totient is φ = 5638430080.

The previous prime is 21144113399. The next prime is 21144113407. The reversal of 21144113400 is 431144112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21144113407) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17619495 + ... + 17620694.

Almost surely, 2^21144113400 is an apocalyptic number.

21144113400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21144113400 is an abundant number, since it is smaller than the sum of its proper divisors (44402640000).

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

21144113400 is a wasteful number, since it uses less digits than its factorization.

21144113400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35240208 (or 35240199 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 21144113400 its reverse (431144112), we get a palindrome (21575257512).

The spelling of 21144113400 in words is "twenty-one billion, one hundred forty-four million, one hundred thirteen thousand, four hundred".