21139301 has 2 divisors, whose sum is σ = 21139302. Its totient is φ = 21139300.

The previous prime is 21139297. The next prime is 21139337. The reversal of 21139301 is 10393112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18576100 + 2563201 = 4310^2 + 1601^2 .

It is a cyclic number.

It is not a de Polignac number, because 21139301 - 2² = 21139297 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21139201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10569650 + 10569651.

It is an arithmetic number, because the mean of its divisors is an integer number (10569651).

Almost surely, 2^21139301 is an apocalyptic number.

It is an amenable number.

21139301 is a deficient number, since it is larger than the sum of its proper divisors (1).

21139301 is an equidigital number, since it uses as much as digits as its factorization.

21139301 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 162, while the sum is 20.

The square root of 21139301 is about 4597.7495582078. The cubic root of 21139301 is about 276.5011068956.

The spelling of 21139301 in words is "twenty-one million, one hundred thirty-nine thousand, three hundred one".