20621311377223 has 16 divisors (see below), whose sum is σ = 21105600482304. Its totient is φ = 20143153386720.

The previous prime is 20621311377209. The next prime is 20621311377323. The reversal of 20621311377223 is 32277311312602.

It is a cyclic number.

It is not a de Polignac number, because 20621311377223 - 2²⁵ = 20621277822791 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20621311377323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1202386 + ... + 6533632.

It is an arithmetic number, because the mean of its divisors is an integer number (1319100030144).

Almost surely, 2^{20621311377223} is an apocalyptic number.

20621311377223 is a deficient number, since it is larger than the sum of its proper divisors (484289105081).

20621311377223 is a wasteful number, since it uses less digits than its factorization.

20621311377223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5331822.

The product of its (nonzero) digits is 127008, while the sum is 40.

Adding to 20621311377223 its reverse (32277311312602), we get a palindrome (52898622689825).

The spelling of 20621311377223 in words is "twenty trillion, six hundred twenty-one billion, three hundred eleven million, three hundred seventy-seven thousand, two hundred twenty-three".