21050371 has 2 divisors, whose sum is σ = 21050372. Its totient is φ = 21050370.

The previous prime is 21050363. The next prime is 21050383. The reversal of 21050371 is 17305012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21050371 - 2³ = 21050363 is a prime.

It is not a weakly prime, because it can be changed into another prime (21050311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10525185 + 10525186.

It is an arithmetic number, because the mean of its divisors is an integer number (10525186).

Almost surely, 2^21050371 is an apocalyptic number.

21050371 is a deficient number, since it is larger than the sum of its proper divisors (1).

21050371 is an equidigital number, since it uses as much as digits as its factorization.

21050371 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 210, while the sum is 19.

The square root of 21050371 is about 4588.0683299184. The cubic root of 21050371 is about 276.1128284408.

Adding to 21050371 its reverse (17305012), we get a palindrome (38355383).

The spelling of 21050371 in words is "twenty-one million, fifty thousand, three hundred seventy-one".