21211110221312 has 80 divisors (see below), whose sum is σ = 46235101402512. Its totient is φ = 9641098936320.

The previous prime is 21211110221297. The next prime is 21211110221321. The reversal of 21211110221312 is 21312201111212.

It is a super-2 number, since 2×21211110221312² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 325006988 + ... + 325072244.

Almost surely, 2^{21211110221312} is an apocalyptic number.

21211110221312 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21211110221312 is an abundant number, since it is smaller than the sum of its proper divisors (25023991181200).

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

21211110221312 is an equidigital number, since it uses as much as digits as its factorization.

21211110221312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122999 (or 122983 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 20.

Adding to 21211110221312 its reverse (21312201111212), we get a palindrome (42523311332524).

The spelling of 21211110221312 in words is "twenty-one trillion, two hundred eleven billion, one hundred ten million, two hundred twenty-one thousand, three hundred twelve".