21220012121000 has 192 divisors, whose sum is σ = 62376315805440. Its totient is φ = 6614029488000.

The previous prime is 21220012120997. The next prime is 21220012121041. The reversal of 21220012121000 is 12121002212.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11679572 + ... + 13373571.

It is an arithmetic number, because the mean of its divisors is an integer number (324876644820).

Almost surely, 2^{21220012121000} is an apocalyptic number.

21220012121000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21220012121000 is an abundant number, since it is smaller than the sum of its proper divisors (41156303684440).

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

21220012121000 is a wasteful number, since it uses less digits than its factorization.

21220012121000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25053193 (or 25053168 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21220012121000 its reverse (12121002212), we get a palindrome (21232133123212).

It can be divided in two parts, 2122001212 and 1000, that added together give a palindrome (2122002212).

The spelling of 21220012121000 in words is "twenty-one trillion, two hundred twenty billion, twelve million, one hundred twenty-one thousand".