21122415242 has 16 divisors (see below), whose sum is σ = 32662025280. Its totient is φ = 10239977952.

The previous prime is 21122415227. The next prime is 21122415317. The reversal of 21122415242 is 24251422112.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1217438 + ... + 1234665.

It is an arithmetic number, because the mean of its divisors is an integer number (2041376580).

Almost surely, 2^21122415242 is an apocalyptic number.

21122415242 is a deficient number, since it is larger than the sum of its proper divisors (11539610038).

21122415242 is a wasteful number, since it uses less digits than its factorization.

21122415242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2452237.

The product of its digits is 2560, while the sum is 26.

Adding to 21122415242 its reverse (24251422112), we get a palindrome (45373837354).

The spelling of 21122415242 in words is "twenty-one billion, one hundred twenty-two million, four hundred fifteen thousand, two hundred forty-two".