21221121101012 has 48 divisors (see below), whose sum is σ = 44955672104448. Its totient is φ = 8556574717440.

The previous prime is 21221121101003. The next prime is 21221121101027. The reversal of 21221121101012 is 21010112112212.

It is a super-3 number, since 3×21221121101012³ (a number of 41 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7074203 + ... + 9616994.

It is an arithmetic number, because the mean of its divisors is an integer number (936576502176).

Almost surely, 2^{21221121101012} is an apocalyptic number.

It is an amenable number.

21221121101012 is an abundant number, since it is smaller than the sum of its proper divisors (23734551003436).

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

21221121101012 is a wasteful number, since it uses less digits than its factorization.

21221121101012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16693896 (or 16693894 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21221121101012 its reverse (21010112112212), we get a palindrome (42231233213224).

The spelling of 21221121101012 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred twenty-one million, one hundred one thousand, twelve".