21121011020200 has 96 divisors (see below), whose sum is σ = 60438585432960. Its totient is φ = 6684451833600.

The previous prime is 21121011020191. The next prime is 21121011020251. The reversal of 21121011020200 is 202011012112.

It is a Harshad number since it is a multiple of its sum of digits (13).

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, 580229356 + ... + 580265755.

It is an arithmetic number, because the mean of its divisors is an integer number (629568598260).

Almost surely, 2^{21121011020200} is an apocalyptic number.

21121011020200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21121011020200 is an abundant number, since it is smaller than the sum of its proper divisors (39317574412760).

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

21121011020200 is a wasteful number, since it uses less digits than its factorization.

21121011020200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1160495147 (or 1160495138 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21121011020200 its reverse (202011012112), we get a palindrome (21323022032312).

The spelling of 21121011020200 in words is "twenty-one trillion, one hundred twenty-one billion, eleven million, twenty thousand, two hundred".