21021102120200 has 192 divisors, whose sum is σ = 63318624432000. Its totient is φ = 6302683146240.

The previous prime is 21021102120149. The next prime is 21021102120203. The reversal of 21021102120200 is 202120112012.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is not an unprimeable number, because it can be changed into a prime (21021102120203) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 30049085 + ... + 30740684.

It is an arithmetic number, because the mean of its divisors is an integer number (329784502250).

Almost surely, 2^{21021102120200} is an apocalyptic number.

21021102120200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21021102120200 is an abundant number, since it is smaller than the sum of its proper divisors (42297522311800).

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

21021102120200 is a wasteful number, since it uses less digits than its factorization.

21021102120200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60789824 (or 60789815 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21021102120200 its reverse (202120112012), we get a palindrome (21223222232212).

The spelling of 21021102120200 in words is "twenty-one trillion, twenty-one billion, one hundred two million, one hundred twenty thousand, two hundred".