21403221342413 has 4 divisors (see below), whose sum is σ = 21421042510428. Its totient is φ = 21385400174400.

The previous prime is 21403221342367. The next prime is 21403221342463. The reversal of 21403221342413 is 31424312230412.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 832479234409 + 20570742108004 = 912403^2 + 4535498^2 .

It is a cyclic number.

It is not a de Polignac number, because 21403221342413 - 2²² = 21403217148109 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21403221342413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21403221342463) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8910582206 + ... + 8910584607.

It is an arithmetic number, because the mean of its divisors is an integer number (5355260627607).

Almost surely, 2^{21403221342413} is an apocalyptic number.

It is an amenable number.

21403221342413 is a deficient number, since it is larger than the sum of its proper divisors (17821168015).

21403221342413 is a wasteful number, since it uses less digits than its factorization.

21403221342413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17821168014.

The product of its (nonzero) digits is 27648, while the sum is 32.

Adding to 21403221342413 its reverse (31424312230412), we get a palindrome (52827533572825).

The spelling of 21403221342413 in words is "twenty-one trillion, four hundred three billion, two hundred twenty-one million, three hundred forty-two thousand, four hundred thirteen".