21001020083 has 2 divisors, whose sum is σ = 21001020084. Its totient is φ = 21001020082.

The previous prime is 21001020077. The next prime is 21001020107. The reversal of 21001020083 is 38002010012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21001020083 - 2²² = 20996825779 is a prime.

It is not a weakly prime, because it can be changed into another prime (21001020983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500510041 + 10500510042.

It is an arithmetic number, because the mean of its divisors is an integer number (10500510042).

Almost surely, 2^21001020083 is an apocalyptic number.

21001020083 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001020083 is an equidigital number, since it uses as much as digits as its factorization.

21001020083 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21001020083 its reverse (38002010012), we get a palindrome (59003030095).

The spelling of 21001020083 in words is "twenty-one billion, one million, twenty thousand, eighty-three".