21440111213400 has 192 divisors, whose sum is σ = 72510132804480. Its totient is φ = 5197346457600.

The previous prime is 21440111213369. The next prime is 21440111213429. The reversal of 21440111213400 is 431211104412.

It is a happy number.

It is a super-3 number, since 3×21440111213400³ (a number of 41 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 157190032 + ... + 157326368.

It is an arithmetic number, because the mean of its divisors is an integer number (377656941690).

Almost surely, 2^{21440111213400} is an apocalyptic number.

21440111213400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21440111213400 is an abundant number, since it is smaller than the sum of its proper divisors (51070021591080).

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

21440111213400 is a wasteful number, since it uses less digits than its factorization.

21440111213400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160194 (or 160185 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

Adding to 21440111213400 its reverse (431211104412), we get a palindrome (21871322317812).

The spelling of 21440111213400 in words is "twenty-one trillion, four hundred forty billion, one hundred eleven million, two hundred thirteen thousand, four hundred".