21012120120000 has 560 divisors, whose sum is σ = 72954682428672. Its totient is φ = 5325365760000.

The previous prime is 21012120119971. The next prime is 21012120120001. The reversal of 21012120120000 is 2102121012.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (21012120120001) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 433295755 + ... + 433344245.

Almost surely, 2^{21012120120000} is an apocalyptic number.

21012120120000 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 21012120120000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36477341214336).

21012120120000 is an abundant number, since it is smaller than the sum of its proper divisors (51942562308672).

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

21012120120000 is a wasteful number, since it uses less digits than its factorization.

21012120120000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48706 (or 48681 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21012120120000 its reverse (2102121012), we get a palindrome (21014222241012).

The spelling of 21012120120000 in words is "twenty-one trillion, twelve billion, one hundred twenty million, one hundred twenty thousand".