21100214242 has 4 divisors (see below), whose sum is σ = 31650321366. Its totient is φ = 10550107120.

The previous prime is 21100214227. The next prime is 21100214243. The reversal of 21100214242 is 24241200112.

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., 14626241721 + 6473972521 = 120939^2 + 80461^2 .

It is not an unprimeable number, because it can be changed into a prime (21100214243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5275053559 + ... + 5275053562.

Almost surely, 2^21100214242 is an apocalyptic number.

21100214242 is a deficient number, since it is larger than the sum of its proper divisors (10550107124).

21100214242 is a wasteful number, since it uses less digits than its factorization.

21100214242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10550107123.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21100214242 its reverse (24241200112), we get a palindrome (45341414354).

The spelling of 21100214242 in words is "twenty-one billion, one hundred million, two hundred fourteen thousand, two hundred forty-two".