21254541400 has 24 divisors (see below), whose sum is σ = 49416809220. Its totient is φ = 8501816480.

The previous prime is 21254541389. The next prime is 21254541443. The reversal of 21254541400 is 414545212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53136154 + ... + 53136553.

Almost surely, 2^21254541400 is an apocalyptic number.

21254541400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21254541400 is an abundant number, since it is smaller than the sum of its proper divisors (28162267820).

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

21254541400 is a wasteful number, since it uses less digits than its factorization.

21254541400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106272723 (or 106272714 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 28.

The spelling of 21254541400 in words is "twenty-one billion, two hundred fifty-four million, five hundred forty-one thousand, four hundred".