20011021212000 has 576 divisors, whose sum is σ = 82125262425024. Its totient is φ = 4222103961600.

The previous prime is 20011021211999. The next prime is 20011021212011. The reversal of 20011021212000 is 21212011002.

It is a super-2 number, since 2×20011021212000² (a number of 27 digits) contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 6335064 + ... + 8952936.

It is an arithmetic number, because the mean of its divisors is an integer number (142578580599).

Almost surely, 2^{20011021212000} is an apocalyptic number.

20011021212000 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 20011021212000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41062631212512).

20011021212000 is an abundant number, since it is smaller than the sum of its proper divisors (62114241213024).

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

20011021212000 is a wasteful number, since it uses less digits than its factorization.

20011021212000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2617928 (or 2617903 counting only the distinct ones).

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

Adding to 20011021212000 its reverse (21212011002), we get a palindrome (20032233223002).

The spelling of 20011021212000 in words is "twenty trillion, eleven billion, twenty-one million, two hundred twelve thousand".