21221313083 has 2 divisors, whose sum is σ = 21221313084. Its totient is φ = 21221313082.

The previous prime is 21221313073. The next prime is 21221313109. The reversal of 21221313083 is 38031312212.

It is an a-pointer prime, because the next prime (21221313109) can be obtained adding 21221313083 to its sum of digits (26).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21221313083 - 2⁶ = 21221313019 is a prime.

It is not a weakly prime, because it can be changed into another prime (21221313073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610656541 + 10610656542.

It is an arithmetic number, because the mean of its divisors is an integer number (10610656542).

Almost surely, 2^21221313083 is an apocalyptic number.

21221313083 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221313083 is an equidigital number, since it uses as much as digits as its factorization.

21221313083 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 26.

Adding to 21221313083 its reverse (38031312212), we get a palindrome (59252625295).

The spelling of 21221313083 in words is "twenty-one billion, two hundred twenty-one million, three hundred thirteen thousand, eighty-three".