21220120556326 has 16 divisors (see below), whose sum is σ = 32857637627520. Its totient is φ = 10267588779840.

The previous prime is 21220120556303. The next prime is 21220120556417. The reversal of 21220120556326 is 62365502102212.

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, 469261 + ... + 6531496.

It is an arithmetic number, because the mean of its divisors is an integer number (2053602351720).

Almost surely, 2^{21220120556326} is an apocalyptic number.

21220120556326 is a deficient number, since it is larger than the sum of its proper divisors (11637517071194).

21220120556326 is a wasteful number, since it uses less digits than its factorization.

21220120556326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7049679.

The product of its (nonzero) digits is 86400, while the sum is 37.

Adding to 21220120556326 its reverse (62365502102212), we get a palindrome (83585622658538).

The spelling of 21220120556326 in words is "twenty-one trillion, two hundred twenty billion, one hundred twenty million, five hundred fifty-six thousand, three hundred twenty-six".