21054430254 has 64 divisors (see below), whose sum is σ = 49980752640. Its totient is φ = 5828613120.

The previous prime is 21054430223. The next prime is 21054430261. The reversal of 21054430254 is 45203445012.

21054430254 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43264 + ... + 209715.

It is an arithmetic number, because the mean of its divisors is an integer number (780949260).

Almost surely, 2^21054430254 is an apocalyptic number.

21054430254 is an abundant number, since it is smaller than the sum of its proper divisors (28926322386).

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

21054430254 is a wasteful number, since it uses less digits than its factorization.

21054430254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253105.

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

Adding to 21054430254 its reverse (45203445012), we get a palindrome (66257875266).

The spelling of 21054430254 in words is "twenty-one billion, fifty-four million, four hundred thirty thousand, two hundred fifty-four".