21011012110000 has 400 divisors, whose sum is σ = 57060893869056. Its totient is φ = 7426080000000.

The previous prime is 21011012109947. The next prime is 21011012110051. The reversal of 21011012110000 is 1121011012.

It is a tau number, because it is divible by the number of its divisors (400).

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1222201405 + ... + 1222218595.

Almost surely, 2^{21011012110000} is an apocalyptic number.

21011012110000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21011012110000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28530446934528).

21011012110000 is an abundant number, since it is smaller than the sum of its proper divisors (36049881759056).

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

21011012110000 is a wasteful number, since it uses less digits than its factorization.

21011012110000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17542 (or 17521 counting only the distinct ones).

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

Adding to 21011012110000 its reverse (1121011012), we get a palindrome (21012133121012).

It can be divided in two parts, 2101 and 1012110000, that added together give a palindrome (1012112101).

The spelling of 21011012110000 in words is "twenty-one trillion, eleven billion, twelve million, one hundred ten thousand".