21349001 has 2 divisors, whose sum is σ = 21349002. Its totient is φ = 21349000.

The previous prime is 21348997. The next prime is 21349007. The reversal of 21349001 is 10094312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19811401 + 1537600 = 4451^2 + 1240^2 .

It is a cyclic number.

It is not a de Polignac number, because 21349001 - 2² = 21348997 is a prime.

It is a super-3 number, since 3×21349001³ (a number of 23 digits) contains 333 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21349007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10674500 + 10674501.

It is an arithmetic number, because the mean of its divisors is an integer number (10674501).

Almost surely, 2^21349001 is an apocalyptic number.

It is an amenable number.

21349001 is a deficient number, since it is larger than the sum of its proper divisors (1).

21349001 is an equidigital number, since it uses as much as digits as its factorization.

21349001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 21349001 is about 4620.4979168916. The cubic root of 21349001 is about 277.4123890839.

The spelling of 21349001 in words is "twenty-one million, three hundred forty-nine thousand, one".