21031000404210 has 192 divisors, whose sum is σ = 58830354086400. Its totient is φ = 5201838061056.

The previous prime is 21031000404209. The next prime is 21031000404221. The reversal of 21031000404210 is 1240400013012.

21031000404210 is a `hidden beast` number, since 2 + 103 + 100 + 0 + 40 + 421 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 6250677 + ... + 9007383.

It is an arithmetic number, because the mean of its divisors is an integer number (306408094200).

Almost surely, 2^{21031000404210} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21031000404210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29415177043200).

21031000404210 is an abundant number, since it is smaller than the sum of its proper divisors (37799353682190).

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

21031000404210 is a wasteful number, since it uses less digits than its factorization.

21031000404210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2756865 (or 2756862 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21031000404210 its reverse (1240400013012), we get a palindrome (22271400417222).

The spelling of 21031000404210 in words is "twenty-one trillion, thirty-one billion, four hundred four thousand, two hundred ten".