21012012083 has 2 divisors, whose sum is σ = 21012012084. Its totient is φ = 21012012082.

The previous prime is 21012012079. The next prime is 21012012137. The reversal of 21012012083 is 38021021012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21012012083 - 2² = 21012012079 is a prime.

It is a super-2 number, since 2×21012012083² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21012012283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506006041 + 10506006042.

It is an arithmetic number, because the mean of its divisors is an integer number (10506006042).

Almost surely, 2^21012012083 is an apocalyptic number.

21012012083 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012012083 is an equidigital number, since it uses as much as digits as its factorization.

21012012083 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 21012012083 its reverse (38021021012), we get a palindrome (59033033095).

The spelling of 21012012083 in words is "twenty-one billion, twelve million, twelve thousand, eighty-three".