21405534222 has 16 divisors (see below), whose sum is σ = 42847149312. Its totient is φ = 7129164600.

The previous prime is 21405534221. The next prime is 21405534229. The reversal of 21405534222 is 22243550412.

It is a self number, because there is not a number n which added to its sum of digits gives 21405534222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21405534221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1495654 + ... + 1509897.

It is an arithmetic number, because the mean of its divisors is an integer number (2677946832).

Almost surely, 2^21405534222 is an apocalyptic number.

21405534222 is an abundant number, since it is smaller than the sum of its proper divisors (21441615090).

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

21405534222 is a wasteful number, since it uses less digits than its factorization.

21405534222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3006743.

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

The spelling of 21405534222 in words is "twenty-one billion, four hundred five million, five hundred thirty-four thousand, two hundred twenty-two".