21011200120000 has 140 divisors (see below), whose sum is σ = 54366208631856. Its totient is φ = 8039067520000.

The previous prime is 21011200119991. The next prime is 21011200120007. The reversal of 21011200120000 is 2100211012.

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

It is not an unprimeable number, because it can be changed into a prime (21011200120007) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 10499131 + ... + 12339130.

Almost surely, 2^{21011200120000} is an apocalyptic number.

21011200120000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21011200120000 is an abundant number, since it is smaller than the sum of its proper divisors (33355008511856).

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

21011200120000 is an equidigital number, since it uses as much as digits as its factorization.

21011200120000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22838316 (or 22838291 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21011200120000 its reverse (2100211012), we get a palindrome (21013300331012).

The spelling of 21011200120000 in words is "twenty-one trillion, eleven billion, two hundred million, one hundred twenty thousand".