21041200000000 has 396 divisors, whose sum is σ = 53901640371096. Its totient is φ = 8204800000000.

The previous prime is 21041199999913. The next prime is 21041200000087. The reversal of 21041200000000 is 214012.

It is an interprime number because it is at equal distance from previous prime (21041199999913) and next prime (21041200000087).

It is a Harshad number since it is a multiple of its sum of digits (10).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 16399999359 + ... + 16400000641.

Almost surely, 2^{21041200000000} is an apocalyptic number.

21041200000000 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 21041200000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26950820185548).

21041200000000 is an abundant number, since it is smaller than the sum of its proper divisors (32860440371096).

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

21041200000000 is an frugal number, since it uses more digits than its factorization.

21041200000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1384 (or 1331 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 21041200000000 its reverse (214012), we get a palindrome (21041200214012).

The spelling of 21041200000000 in words is "twenty-one trillion, forty-one billion, two hundred million", and thus it is an aban number.