21033212371 has 2 divisors, whose sum is σ = 21033212372. Its totient is φ = 21033212370.

The previous prime is 21033212309. The next prime is 21033212393. The reversal of 21033212371 is 17321233012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21033212371 - 2¹⁷ = 21033081299 is a prime.

It is not a weakly prime, because it can be changed into another prime (21033212471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10516606185 + 10516606186.

It is an arithmetic number, because the mean of its divisors is an integer number (10516606186).

Almost surely, 2^21033212371 is an apocalyptic number.

21033212371 is a deficient number, since it is larger than the sum of its proper divisors (1).

21033212371 is an equidigital number, since it uses as much as digits as its factorization.

21033212371 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 25.

Adding to 21033212371 its reverse (17321233012), we get a palindrome (38354445383).

The spelling of 21033212371 in words is "twenty-one billion, thirty-three million, two hundred twelve thousand, three hundred seventy-one".