21011000101212 has 96 divisors (see below), whose sum is σ = 54564989681664. Its totient is φ = 6239102443200.

The previous prime is 21011000101207. The next prime is 21011000101219. The reversal of 21011000101212 is 21210100011012.

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 (21011000101219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4529998 + ... + 7908405.

It is an arithmetic number, because the mean of its divisors is an integer number (568385309184).

Almost surely, 2^{21011000101212} is an apocalyptic number.

21011000101212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21011000101212 is an abundant number, since it is smaller than the sum of its proper divisors (33553989580452).

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

21011000101212 is a wasteful number, since it uses less digits than its factorization.

21011000101212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12438679 (or 12438677 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21011000101212 its reverse (21210100011012), we get a palindrome (42221100112224).

The spelling of 21011000101212 in words is "twenty-one trillion, eleven billion, one hundred one thousand, two hundred twelve".