21405450130 has 32 divisors (see below), whose sum is σ = 39872010240. Its totient is φ = 8264114880.

The previous prime is 21405450127. The next prime is 21405450133. The reversal of 21405450130 is 3105450412.

It is a happy number.

21405450130 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (21405450127) and next prime (21405450133).

It is a junction number, because it is equal to n+sod(n) for n = 21405450095 and 21405450104.

It is not an unprimeable number, because it can be changed into a prime (21405450133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 972507 + ... + 994273.

It is an arithmetic number, because the mean of its divisors is an integer number (1246000320).

Almost surely, 2^21405450130 is an apocalyptic number.

21405450130 is a deficient number, since it is larger than the sum of its proper divisors (18466560110).

21405450130 is a wasteful number, since it uses less digits than its factorization.

21405450130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25194.

The product of its (nonzero) digits is 2400, while the sum is 25.

The spelling of 21405450130 in words is "twenty-one billion, four hundred five million, four hundred fifty thousand, one hundred thirty".