21263210642422 has 32 divisors (see below), whose sum is σ = 37299417408000. Its totient is φ = 8900760411648.

The previous prime is 21263210642417. The next prime is 21263210642441. The reversal of 21263210642422 is 22424601236212.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56333079 + ... + 56709277.

It is an arithmetic number, because the mean of its divisors is an integer number (1165606794000).

Almost surely, 2^{21263210642422} is an apocalyptic number.

21263210642422 is a deficient number, since it is larger than the sum of its proper divisors (16036206765578).

21263210642422 is a wasteful number, since it uses less digits than its factorization.

21263210642422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470140.

The product of its (nonzero) digits is 110592, while the sum is 37.

Adding to 21263210642422 its reverse (22424601236212), we get a palindrome (43687811878634).

The spelling of 21263210642422 in words is "twenty-one trillion, two hundred sixty-three billion, two hundred ten million, six hundred forty-two thousand, four hundred twenty-two".