21620083 has 2 divisors, whose sum is σ = 21620084. Its totient is φ = 21620082.

The previous prime is 21620063. The next prime is 21620087. The reversal of 21620083 is 38002612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21620083 - 2²¹ = 19522931 is a prime.

It is a super-3 number, since 3×21620083³ (a number of 23 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (21620087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10810041 + 10810042.

It is an arithmetic number, because the mean of its divisors is an integer number (10810042).

Almost surely, 2^21620083 is an apocalyptic number.

21620083 is a deficient number, since it is larger than the sum of its proper divisors (1).

21620083 is an equidigital number, since it uses as much as digits as its factorization.

21620083 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 21620083 is about 4649.7401002637. The cubic root of 21620083 is about 278.5816153440.

Adding to 21620083 its reverse (38002612), we get a palindrome (59622695).

The spelling of 21620083 in words is "twenty-one million, six hundred twenty thousand, eighty-three".