21400110420 has 48 divisors (see below), whose sum is σ = 64529566080. Its totient is φ = 5267719296.

The previous prime is 21400110401. The next prime is 21400110427. The reversal of 21400110420 is 2401100412.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21400110420.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21400110427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13717240 + ... + 13718799.

It is an arithmetic number, because the mean of its divisors is an integer number (1344365960).

Almost surely, 2^21400110420 is an apocalyptic number.

21400110420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21400110420 is an abundant number, since it is smaller than the sum of its proper divisors (43129455660).

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

21400110420 is a wasteful number, since it uses less digits than its factorization.

21400110420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27436064 (or 27436062 counting only the distinct ones).

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

Adding to 21400110420 its reverse (2401100412), we get a palindrome (23801210832).

The spelling of 21400110420 in words is "twenty-one billion, four hundred million, one hundred ten thousand, four hundred twenty".