21011000022012 has 192 divisors, whose sum is σ = 66074965254144. Its totient is φ = 5018447266560.

The previous prime is 21011000022007. The next prime is 21011000022013. The reversal of 21011000022012 is 21022000011012.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011000022013) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 166258 + ... + 6484569.

It is an arithmetic number, because the mean of its divisors is an integer number (344140444032).

Almost surely, 2^{21011000022012} is an apocalyptic number.

21011000022012 is a gapful number since it is divisible by the number (22) 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 21011000022012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33037482627072).

21011000022012 is an abundant number, since it is smaller than the sum of its proper divisors (45063965232132).

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

21011000022012 is a wasteful number, since it uses less digits than its factorization.

21011000022012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6651128 (or 6651126 counting only the distinct ones).

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

Adding to 21011000022012 its reverse (21022000011012), we get a palindrome (42033000033024).

The spelling of 21011000022012 in words is "twenty-one trillion, eleven billion, twenty-two thousand, twelve".