21620203001 has 4 divisors (see below), whose sum is σ = 21620525904. Its totient is φ = 21619880100.

The previous prime is 21620202997. The next prime is 21620203039. The reversal of 21620203001 is 10030202612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21620203001 - 2² = 21620202997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21620203061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19295 + ... + 208836.

It is an arithmetic number, because the mean of its divisors is an integer number (5405131476).

Almost surely, 2^21620203001 is an apocalyptic number.

It is an amenable number.

21620203001 is a deficient number, since it is larger than the sum of its proper divisors (322903).

21620203001 is an equidigital number, since it uses as much as digits as its factorization.

21620203001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322902.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21620203001 its reverse (10030202612), we get a palindrome (31650405613).

The spelling of 21620203001 in words is "twenty-one billion, six hundred twenty million, two hundred three thousand, one".