21275572435 has 32 divisors (see below), whose sum is σ = 28047394368. Its totient is φ = 15396026880.

The previous prime is 21275572433. The next prime is 21275572463. The reversal of 21275572435 is 53427557212.

It is not a de Polignac number, because 21275572435 - 2¹ = 21275572433 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21275572391 and 21275572400.

It is not an unprimeable number, because it can be changed into a prime (21275572433) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3238464 + ... + 3245026.

It is an arithmetic number, because the mean of its divisors is an integer number (876481074).

Almost surely, 2^21275572435 is an apocalyptic number.

21275572435 is a deficient number, since it is larger than the sum of its proper divisors (6771821933).

21275572435 is a wasteful number, since it uses less digits than its factorization.

21275572435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7575.

The product of its digits is 588000, while the sum is 43.

The spelling of 21275572435 in words is "twenty-one billion, two hundred seventy-five million, five hundred seventy-two thousand, four hundred thirty-five".