21101011001200 has 120 divisors (see below), whose sum is σ = 54835316908848. Its totient is φ = 7756819875840.

The previous prime is 21101011001179. The next prime is 21101011001209. The reversal of 21101011001200 is 210011010112.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101011001209) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7757677 + ... + 10118476.

Almost surely, 2^{21101011001200} is an apocalyptic number.

21101011001200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21101011001200 is an abundant number, since it is smaller than the sum of its proper divisors (33734305907648).

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

21101011001200 is a wasteful number, since it uses less digits than its factorization.

21101011001200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17876411 (or 17876400 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21101011001200 its reverse (210011010112), we get a palindrome (21311022011312).

The spelling of 21101011001200 in words is "twenty-one trillion, one hundred one billion, eleven million, one thousand, two hundred".