21620503474271 has 16 divisors (see below), whose sum is σ = 23859775668288. Its totient is φ = 19463876640000.

The previous prime is 21620503474261. The next prime is 21620503474279. The reversal of 21620503474271 is 17247430502612.

It is not a de Polignac number, because 21620503474271 - 2⁴² = 17222456963167 is a prime.

It is a super-3 number, since 3×21620503474271³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21620503474279) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5486480 + ... + 8564021.

It is an arithmetic number, because the mean of its divisors is an integer number (1491235979268).

Almost surely, 2^{21620503474271} is an apocalyptic number.

21620503474271 is a deficient number, since it is larger than the sum of its proper divisors (2239272194017).

21620503474271 is a wasteful number, since it uses less digits than its factorization.

21620503474271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14053442.

The product of its (nonzero) digits is 564480, while the sum is 44.

Adding to 21620503474271 its reverse (17247430502612), we get a palindrome (38867933976883).

The spelling of 21620503474271 in words is "twenty-one trillion, six hundred twenty billion, five hundred three million, four hundred seventy-four thousand, two hundred seventy-one".