21311013083 has 2 divisors, whose sum is σ = 21311013084. Its totient is φ = 21311013082.

The previous prime is 21311013079. The next prime is 21311013133. The reversal of 21311013083 is 38031011312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21311013083 - 2² = 21311013079 is a prime.

It is not a weakly prime, because it can be changed into another prime (21311033083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10655506541 + 10655506542.

It is an arithmetic number, because the mean of its divisors is an integer number (10655506542).

Almost surely, 2^21311013083 is an apocalyptic number.

21311013083 is a deficient number, since it is larger than the sum of its proper divisors (1).

21311013083 is an equidigital number, since it uses as much as digits as its factorization.

21311013083 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 21311013083 its reverse (38031011312), we get a palindrome (59342024395).

The spelling of 21311013083 in words is "twenty-one billion, three hundred eleven million, thirteen thousand, eighty-three".