21405450126 has 16 divisors (see below), whose sum is σ = 42818848128. Its totient is φ = 7133825400.

The previous prime is 21405450119. The next prime is 21405450127. The reversal of 21405450126 is 62105450412.

21405450126 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 21405450093 and 21405450102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21405450127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 295860 + ... + 361031.

It is an arithmetic number, because the mean of its divisors is an integer number (2676178008).

Almost surely, 2^21405450126 is an apocalyptic number.

21405450126 is an abundant number, since it is smaller than the sum of its proper divisors (21413398002).

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

21405450126 is a wasteful number, since it uses less digits than its factorization.

21405450126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662327.

The product of its (nonzero) digits is 9600, while the sum is 30.

The spelling of 21405450126 in words is "twenty-one billion, four hundred five million, four hundred fifty thousand, one hundred twenty-six".