21011011101200 has 30 divisors (see below), whose sum is σ = 50478954171594. Its totient is φ = 8404404440320.

The previous prime is 21011011101161. The next prime is 21011011101221. The reversal of 21011011101200 is 210111011012.

It can be written as a sum of positive squares in 3 ways, for example, as 6264888856576 + 14746122244624 = 2502976^2 + 3840068^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 26263763477 + ... + 26263764276.

Almost surely, 2^{21011011101200} is an apocalyptic number.

21011011101200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21011011101200 is an abundant number, since it is smaller than the sum of its proper divisors (29467943070394).

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

21011011101200 is a wasteful number, since it uses less digits than its factorization.

21011011101200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52527527771 (or 52527527760 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 21011011101200 its reverse (210111011012), we get a palindrome (21221122112212).

The spelling of 21011011101200 in words is "twenty-one trillion, eleven billion, eleven million, one hundred one thousand, two hundred".