21202412242 has 32 divisors (see below), whose sum is σ = 36489844224. Its totient is φ = 9150585600.

The previous prime is 21202412233. The next prime is 21202412243. The reversal of 21202412242 is 24221420212.

It is a super-2 number, since 2×21202412242² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (21202412243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 257143 + ... + 329434.

It is an arithmetic number, because the mean of its divisors is an integer number (1140307632).

Almost surely, 2^21202412242 is an apocalyptic number.

21202412242 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21202412242 is a deficient number, since it is larger than the sum of its proper divisors (15287431982).

21202412242 is a wasteful number, since it uses less digits than its factorization.

21202412242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 586674.

The product of its (nonzero) digits is 1024, while the sum is 22.

Adding to 21202412242 its reverse (24221420212), we get a palindrome (45423832454).

The spelling of 21202412242 in words is "twenty-one billion, two hundred two million, four hundred twelve thousand, two hundred forty-two".