21211212083 has 2 divisors, whose sum is σ = 21211212084. Its totient is φ = 21211212082.

The previous prime is 21211212067. The next prime is 21211212107. The reversal of 21211212083 is 38021211212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21211212083 - 2⁴ = 21211212067 is a prime.

It is not a weakly prime, because it can be changed into another prime (21211214083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605606041 + 10605606042.

It is an arithmetic number, because the mean of its divisors is an integer number (10605606042).

Almost surely, 2^21211212083 is an apocalyptic number.

21211212083 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211212083 is an equidigital number, since it uses as much as digits as its factorization.

21211212083 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 23.

Adding to 21211212083 its reverse (38021211212), we get a palindrome (59232423295).

The spelling of 21211212083 in words is "twenty-one billion, two hundred eleven million, two hundred twelve thousand, eighty-three".