21011001200000 has 192 divisors, whose sum is σ = 59793115183200. Its totient is φ = 7203770880000.

The previous prime is 21011001199973. The next prime is 21011001200027. The reversal of 21011001200000 is 210011012.

It is an interprime number because it is at equal distance from previous prime (21011001199973) and next prime (21011001200027).

It is a Harshad number since it is a multiple of its sum of digits (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 951965 + ... + 6551964.

Almost surely, 2^{21011001200000} is an apocalyptic number.

21011001200000 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 21011001200000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29896557591600).

21011001200000 is an abundant number, since it is smaller than the sum of its proper divisors (38782113983200).

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

21011001200000 is an frugal number, since it uses more digits than its factorization.

21011001200000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7503975 (or 7503943 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 21011001200000 its reverse (210011012), we get a palindrome (21011211211012).

The spelling of 21011001200000 in words is "twenty-one trillion, eleven billion, one million, two hundred thousand".