21200101242 has 16 divisors (see below), whose sum is σ = 42404315520. Its totient is φ = 7066014912.

The previous prime is 21200101193. The next prime is 21200101249. The reversal of 21200101242 is 24210100212.

It is not an unprimeable number, because it can be changed into a prime (21200101249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102223 + ... + 229890.

It is an arithmetic number, because the mean of its divisors is an integer number (2650269720).

Almost surely, 2^21200101242 is an apocalyptic number.

21200101242 is an abundant number, since it is smaller than the sum of its proper divisors (21204214278).

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

21200101242 is a wasteful number, since it uses less digits than its factorization.

21200101242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342757.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21200101242 its reverse (24210100212), we get a palindrome (45410201454).

The spelling of 21200101242 in words is "twenty-one billion, two hundred million, one hundred one thousand, two hundred forty-two".