21000012010000 has 100 divisors (see below), whose sum is σ = 53519083723600. Its totient is φ = 7957899216000.

The previous prime is 21000012009983. The next prime is 21000012010009. The reversal of 21000012010000 is 1021000012.

It is a tau number, because it is divible by the number of its divisors (100).

It is not an unprimeable number, because it can be changed into a prime (21000012010009) 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, 55073190 + ... + 55453189.

It is an arithmetic number, because the mean of its divisors is an integer number (535190837236).

Almost surely, 2^{21000012010000} is an apocalyptic number.

21000012010000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21000012010000 is an abundant number, since it is smaller than the sum of its proper divisors (32519071713600).

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

21000012010000 is a wasteful number, since it uses less digits than its factorization.

21000012010000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110526426 (or 110526405 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 21000012010000 its reverse (1021000012), we get a palindrome (21001033010012).

The spelling of 21000012010000 in words is "twenty-one trillion, twelve million, ten thousand".