21403312221343 has 16 divisors (see below), whose sum is σ = 23106895692160. Its totient is φ = 19707900016896.

The previous prime is 21403312221341. The next prime is 21403312221383. The reversal of 21403312221343 is 34312221330412.

It is not a de Polignac number, because 21403312221343 - 2¹ = 21403312221341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21403312221341) 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, 206072221 + ... + 206176057.

It is an arithmetic number, because the mean of its divisors is an integer number (1444180980760).

Almost surely, 2^{21403312221343} is an apocalyptic number.

21403312221343 is a deficient number, since it is larger than the sum of its proper divisors (1703583470817).

21403312221343 is a wasteful number, since it uses less digits than its factorization.

21403312221343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143026.

The product of its (nonzero) digits is 20736, while the sum is 31.

Adding to 21403312221343 its reverse (34312221330412), we get a palindrome (55715533551755).

The spelling of 21403312221343 in words is "twenty-one trillion, four hundred three billion, three hundred twelve million, two hundred twenty-one thousand, three hundred forty-three".