21404405232210 has 384 divisors, whose sum is σ = 71737427607552. Its totient is φ = 3973101580800.

The previous prime is 21404405232167. The next prime is 21404405232227. The reversal of 21404405232210 is 1223250440412.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 9195117 + ... + 11285343.

It is an arithmetic number, because the mean of its divisors is an integer number (186816217728).

Almost surely, 2^{21404405232210} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21404405232210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35868713803776).

21404405232210 is an abundant number, since it is smaller than the sum of its proper divisors (50333022375342).

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

21404405232210 is a wasteful number, since it uses less digits than its factorization.

21404405232210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2090310 (or 2090299 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 30.

Adding to 21404405232210 its reverse (1223250440412), we get a palindrome (22627655672622).

The spelling of 21404405232210 in words is "twenty-one trillion, four hundred four billion, four hundred five million, two hundred thirty-two thousand, two hundred ten".