21210100421304 has 32 divisors (see below), whose sum is σ = 54735743024640. Its totient is φ = 6841967877600.

The previous prime is 21210100421299. The next prime is 21210100421357. The reversal of 21210100421304 is 40312400101212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14254099002 + ... + 14254100489.

It is an arithmetic number, because the mean of its divisors is an integer number (1710491969520).

Almost surely, 2^{21210100421304} is an apocalyptic number.

21210100421304 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21210100421304 is an abundant number, since it is smaller than the sum of its proper divisors (33525642603336).

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

21210100421304 is a wasteful number, since it uses less digits than its factorization.

21210100421304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28508199531 (or 28508199527 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 21210100421304 its reverse (40312400101212), we get a palindrome (61522500522516).

The spelling of 21210100421304 in words is "twenty-one trillion, two hundred ten billion, one hundred million, four hundred twenty-one thousand, three hundred four".