21520541403422 has 16 divisors (see below), whose sum is σ = 33081663045312. Its totient is φ = 10493534897280.

The previous prime is 21520541403401. The next prime is 21520541403443. The reversal of 21520541403422 is 22430414502512.

It is an interprime number because it is at equal distance from previous prime (21520541403401) and next prime (21520541403443).

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, 53425343 + ... + 53826650.

It is an arithmetic number, because the mean of its divisors is an integer number (2067603940332).

Almost surely, 2^{21520541403422} is an apocalyptic number.

21520541403422 is a deficient number, since it is larger than the sum of its proper divisors (11561121641890).

21520541403422 is a wasteful number, since it uses less digits than its factorization.

21520541403422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107254483.

The product of its (nonzero) digits is 76800, while the sum is 35.

Adding to 21520541403422 its reverse (22430414502512), we get a palindrome (43950955905934).

The spelling of 21520541403422 in words is "twenty-one trillion, five hundred twenty billion, five hundred forty-one million, four hundred three thousand, four hundred twenty-two".