21220101110012 has 24 divisors (see below), whose sum is σ = 42441792225504. Its totient is φ = 9093988331712.

The previous prime is 21220101110011. The next prime is 21220101110053. The reversal of 21220101110012 is 21001110102212.

It is a super-2 number, since 2×21220101110012² (a number of 27 digits) contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220101110011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13435043 + ... + 14931194.

It is an arithmetic number, because the mean of its divisors is an integer number (1768408009396).

Almost surely, 2^{21220101110012} is an apocalyptic number.

It is an amenable number.

21220101110012 is an abundant number, since it is smaller than the sum of its proper divisors (21221691115492).

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

21220101110012 is a wasteful number, since it uses less digits than its factorization.

21220101110012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28392965 (or 28392963 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21220101110012 its reverse (21001110102212), we get a palindrome (42221211212224).

The spelling of 21220101110012 in words is "twenty-one trillion, two hundred twenty billion, one hundred one million, one hundred ten thousand, twelve".