21240120322 has 16 divisors (see below), whose sum is σ = 32764351032. Its totient is φ = 10319425920.

The previous prime is 21240120299. The next prime is 21240120323. The reversal of 21240120322 is 22302104212.

It can be written as a sum of positive squares in 4 ways, for example, as 13539882321 + 7700238001 = 116361^2 + 87751^2 .

It is a super-2 number, since 2×21240120322² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21240120322.

It is not an unprimeable number, because it can be changed into a prime (21240120323) 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, 132273 + ... + 244900.

Almost surely, 2^21240120322 is an apocalyptic number.

21240120322 is a deficient number, since it is larger than the sum of its proper divisors (11524230710).

21240120322 is a wasteful number, since it uses less digits than its factorization.

21240120322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377973.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21240120322 its reverse (22302104212), we get a palindrome (43542224534).

The spelling of 21240120322 in words is "twenty-one billion, two hundred forty million, one hundred twenty thousand, three hundred twenty-two".