21400104220 has 192 divisors, whose sum is σ = 52881558912. Its totient is φ = 7188480000.

The previous prime is 21400104211. The next prime is 21400104251. The reversal of 21400104220 is 2240100412.

It is a junction number, because it is equal to n+sod(n) for n = 21400104194 and 21400104203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 68370784 + ... + 68371096.

It is an arithmetic number, because the mean of its divisors is an integer number (275424786).

Almost surely, 2^21400104220 is an apocalyptic number.

21400104220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21400104220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26440779456).

21400104220 is an abundant number, since it is smaller than the sum of its proper divisors (31481454692).

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

21400104220 is a wasteful number, since it uses less digits than its factorization.

21400104220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632 (or 630 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21400104220 its reverse (2240100412), we get a palindrome (23640204632).

The spelling of 21400104220 in words is "twenty-one billion, four hundred million, one hundred four thousand, two hundred twenty".