21242424122 has 4 divisors (see below), whose sum is σ = 31863636186. Its totient is φ = 10621212060.

The previous prime is 21242424089. The next prime is 21242424149. The reversal of 21242424122 is 22142424212.

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., 17886655081 + 3355769041 = 133741^2 + 57929^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21242424091 and 21242424100.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5310606029 + ... + 5310606032.

Almost surely, 2^21242424122 is an apocalyptic number.

21242424122 is a deficient number, since it is larger than the sum of its proper divisors (10621212064).

21242424122 is a wasteful number, since it uses less digits than its factorization.

21242424122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10621212063.

The product of its digits is 4096, while the sum is 26.

Adding to 21242424122 its reverse (22142424212), we get a palindrome (43384848334).

The spelling of 21242424122 in words is "twenty-one billion, two hundred forty-two million, four hundred twenty-four thousand, one hundred twenty-two".