21301242121104 has 40 divisors (see below), whose sum is σ = 60030773251872. Its totient is φ = 6454921854720.

The previous prime is 21301242121051. The next prime is 21301242121109. The reversal of 21301242121104 is 40112124210312.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (21301242121109) 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 7 ways as a sum of consecutive naturals, for example, 20171630269 + ... + 20171631324.

Almost surely, 2^{21301242121104} is an apocalyptic number.

21301242121104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21301242121104 is an abundant number, since it is smaller than the sum of its proper divisors (38729531130768).

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

21301242121104 is a wasteful number, since it uses less digits than its factorization.

21301242121104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40343261615 (or 40343261609 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

Adding to 21301242121104 its reverse (40112124210312), we get a palindrome (61413366331416).

The spelling of 21301242121104 in words is "twenty-one trillion, three hundred one billion, two hundred forty-two million, one hundred twenty-one thousand, one hundred four".