21012121120000 has 180 divisors, whose sum is σ = 52758080585056. Its totient is φ = 8349177600000.

The previous prime is 21012121119967. The next prime is 21012121120007. The reversal of 21012121120000 is 2112121012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012121120007) 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, 23725147 + ... + 24594853.

Almost surely, 2^{21012121120000} is an apocalyptic number.

21012121120000 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 21012121120000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26379040292528).

21012121120000 is an abundant number, since it is smaller than the sum of its proper divisors (31745959465056).

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

21012121120000 is an frugal number, since it uses more digits than its factorization.

21012121120000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 869894 (or 869865 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21012121120000 its reverse (2112121012), we get a palindrome (21014233241012).

The spelling of 21012121120000 in words is "twenty-one trillion, twelve billion, one hundred twenty-one million, one hundred twenty thousand".