21620319501 has 16 divisors (see below), whose sum is σ = 31471861248. Its totient is φ = 13093172400.

The previous prime is 21620319463. The next prime is 21620319541. The reversal of 21620319501 is 10591302612.

It is not a de Polignac number, because 21620319501 - 2¹⁵ = 21620286733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21620319541) 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, 207505 + ... + 293766.

It is an arithmetic number, because the mean of its divisors is an integer number (1966991328).

Almost surely, 2^21620319501 is an apocalyptic number.

It is an amenable number.

21620319501 is a deficient number, since it is larger than the sum of its proper divisors (9851541747).

21620319501 is a wasteful number, since it uses less digits than its factorization.

21620319501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502592.

The product of its (nonzero) digits is 3240, while the sum is 30.

The spelling of 21620319501 in words is "twenty-one billion, six hundred twenty million, three hundred nineteen thousand, five hundred one".