21100034242 has 32 divisors (see below), whose sum is σ = 38098944000. Its totient is φ = 8561600208.

The previous prime is 21100034231. The next prime is 21100034243. The reversal of 21100034242 is 24243000112.

It is a super-2 number, since 2×21100034242² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (21100034243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 418509 + ... + 466207.

It is an arithmetic number, because the mean of its divisors is an integer number (1190592000).

Almost surely, 2^21100034242 is an apocalyptic number.

21100034242 is a deficient number, since it is larger than the sum of its proper divisors (16998909758).

21100034242 is a wasteful number, since it uses less digits than its factorization.

21100034242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49390.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21100034242 its reverse (24243000112), we get a palindrome (45343034354).

The spelling of 21100034242 in words is "twenty-one billion, one hundred million, thirty-four thousand, two hundred forty-two".