21321100121312 has 12 divisors (see below), whose sum is σ = 41975915863896. Its totient is φ = 10660550060640.

The previous prime is 21321100121291. The next prime is 21321100121341. The reversal of 21321100121312 is 21312100112312.

It is a super-2 number, since 2×21321100121312² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333142189364 + ... + 333142189427.

It is an arithmetic number, because the mean of its divisors is an integer number (3497992988658).

Almost surely, 2^{21321100121312} is an apocalyptic number.

It is an amenable number.

21321100121312 is a deficient number, since it is larger than the sum of its proper divisors (20654815742584).

21321100121312 is an equidigital number, since it uses as much as digits as its factorization.

21321100121312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666284378801 (or 666284378793 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 21321100121312 its reverse (21312100112312), we get a palindrome (42633200233624).

The spelling of 21321100121312 in words is "twenty-one trillion, three hundred twenty-one billion, one hundred million, one hundred twenty-one thousand, three hundred twelve".