21040253405400 has 96 divisors (see below), whose sum is σ = 65262124117440. Its totient is φ = 5607522322560.

The previous prime is 21040253405393. The next prime is 21040253405417. The reversal of 21040253405400 is 450435204012.

21040253405400 is digitally balanced in base 5 and base 6, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8988174 + ... + 11084573.

It is an arithmetic number, because the mean of its divisors is an integer number (679813792890).

Almost surely, 2^{21040253405400} is an apocalyptic number.

21040253405400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21040253405400 is an abundant number, since it is smaller than the sum of its proper divisors (44221870712040).

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

21040253405400 is a wasteful number, since it uses less digits than its factorization.

21040253405400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20074513 (or 20074504 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

Adding to 21040253405400 its reverse (450435204012), we get a palindrome (21490688609412).

The spelling of 21040253405400 in words is "twenty-one trillion, forty billion, two hundred fifty-three million, four hundred five thousand, four hundred".