21222030240506 has 4 divisors (see below), whose sum is σ = 31833045360762. Its totient is φ = 10611015120252.

The previous prime is 21222030240451. The next prime is 21222030240529. The reversal of 21222030240506 is 60504203022212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 13078283864881 + 8143746375625 = 3616391^2 + 2853725^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5305507560125 + ... + 5305507560128.

Almost surely, 2^{21222030240506} is an apocalyptic number.

21222030240506 is a deficient number, since it is larger than the sum of its proper divisors (10611015120256).

21222030240506 is a wasteful number, since it uses less digits than its factorization.

21222030240506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10611015120255.

The product of its (nonzero) digits is 11520, while the sum is 29.

Adding to 21222030240506 its reverse (60504203022212), we get a palindrome (81726233262718).

The spelling of 21222030240506 in words is "twenty-one trillion, two hundred twenty-two billion, thirty million, two hundred forty thousand, five hundred six".