134206021 has 2 divisors, whose sum is σ = 134206022. Its totient is φ = 134206020.

The previous prime is 134206019. The next prime is 134206031. The reversal of 134206021 is 120602431.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120143521 + 14062500 = 10961^2 + 3750^2 .

It is a cyclic number.

It is not a de Polignac number, because 134206021 - 2¹ = 134206019 is a prime.

It is a super-2 number, since 2×134206021² = 36022512145304882, which contains 22 as substring.

Together with 134206019, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 134206021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (134206031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67103010 + 67103011.

It is an arithmetic number, because the mean of its divisors is an integer number (67103011).

Almost surely, 2^134206021 is an apocalyptic number.

It is an amenable number.

134206021 is a deficient number, since it is larger than the sum of its proper divisors (1).

134206021 is an equidigital number, since it uses as much as digits as its factorization.

134206021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 134206021 is about 11584.7322368711. The cubic root of 134206021 is about 511.9851133469.

Adding to 134206021 its reverse (120602431), we get a palindrome (254808452).

The spelling of 134206021 in words is "one hundred thirty-four million, two hundred six thousand, twenty-one".