21113342473 has 2 divisors, whose sum is σ = 21113342474. Its totient is φ = 21113342472.

The previous prime is 21113342363. The next prime is 21113342483. The reversal of 21113342473 is 37424331112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11050845129 + 10062497344 = 105123^2 + 100312^2 .

It is a cyclic number.

It is not a de Polignac number, because 21113342473 - 2¹⁷ = 21113211401 is a prime.

It is a super-3 number, since 3×21113342473³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (21113342483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556671236 + 10556671237.

It is an arithmetic number, because the mean of its divisors is an integer number (10556671237).

Almost surely, 2^21113342473 is an apocalyptic number.

It is an amenable number.

21113342473 is a deficient number, since it is larger than the sum of its proper divisors (1).

21113342473 is an equidigital number, since it uses as much as digits as its factorization.

21113342473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 31.

Adding to 21113342473 its reverse (37424331112), we get a palindrome (58537673585).

The spelling of 21113342473 in words is "twenty-one billion, one hundred thirteen million, three hundred forty-two thousand, four hundred seventy-three".