21321400212343 has 16 divisors (see below), whose sum is σ = 26584569897984. Its totient is φ = 16612799988960.

The previous prime is 21321400212289. The next prime is 21321400212349. The reversal of 21321400212343 is 34321200412312.

It is not a de Polignac number, because 21321400212343 - 2⁹ = 21321400211831 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21321400212349) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9642780 + ... + 11645857.

It is an arithmetic number, because the mean of its divisors is an integer number (1661535618624).

Almost surely, 2^{21321400212343} is an apocalyptic number.

21321400212343 is a deficient number, since it is larger than the sum of its proper divisors (5263169685641).

21321400212343 is a wasteful number, since it uses less digits than its factorization.

21321400212343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21301662.

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 21321400212343 its reverse (34321200412312), we get a palindrome (55642600624655).

The spelling of 21321400212343 in words is "twenty-one trillion, three hundred twenty-one billion, four hundred million, two hundred twelve thousand, three hundred forty-three".