21202102242 has 64 divisors (see below), whose sum is σ = 51195494400. Its totient is φ = 6479410320.

The previous prime is 21202102241. The next prime is 21202102253. The reversal of 21202102242 is 24220120212.

21202102242 is a `hidden beast` number, since 212 + 0 + 210 + 2 + 242 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21202102241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 301498 + ... + 365109.

It is an arithmetic number, because the mean of its divisors is an integer number (799929600).

Almost surely, 2^21202102242 is an apocalyptic number.

21202102242 is an abundant number, since it is smaller than the sum of its proper divisors (29993392158).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21202102242 is a wasteful number, since it uses less digits than its factorization.

21202102242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666668 (or 666662 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 21202102242 its reverse (24220120212), we get a palindrome (45422222454).

The spelling of 21202102242 in words is "twenty-one billion, two hundred two million, one hundred two thousand, two hundred forty-two".