21012011101200 has 240 divisors, whose sum is σ = 76948810060160. Its totient is φ = 4801194639360.

The previous prime is 21012011101177. The next prime is 21012011101229. The reversal of 21012011101200 is 210111021012.

It is a tau number, because it is divible by the number of its divisors (240).

It is a super-2 number, since 2×21012011101200² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 25713312 + ... + 26517888.

Almost surely, 2^{21012011101200} is an apocalyptic number.

21012011101200 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 21012011101200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38474405030080).

21012011101200 is an abundant number, since it is smaller than the sum of its proper divisors (55936798958960).

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

21012011101200 is a wasteful number, since it uses less digits than its factorization.

21012011101200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807714 (or 807703 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21012011101200 its reverse (210111021012), we get a palindrome (21222122122212).

The spelling of 21012011101200 in words is "twenty-one trillion, twelve billion, eleven million, one hundred one thousand, two hundred".