36129221 has 2 divisors, whose sum is σ = 36129222. Its totient is φ = 36129220.

The previous prime is 36129193. The next prime is 36129257. The reversal of 36129221 is 12292163.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35832196 + 297025 = 5986^2 + 545^2 .

It is a cyclic number.

It is not a de Polignac number, because 36129221 - 2¹⁸ = 35867077 is a prime.

It is a super-2 number, since 2×36129221² = 2610641220133682, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36129271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18064610 + 18064611.

It is an arithmetic number, because the mean of its divisors is an integer number (18064611).

Almost surely, 2^36129221 is an apocalyptic number.

It is an amenable number.

36129221 is a deficient number, since it is larger than the sum of its proper divisors (1).

36129221 is an equidigital number, since it uses as much as digits as its factorization.

36129221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 26.

The square root of 36129221 is about 6010.7587707377. The cubic root of 36129221 is about 330.5873256672.

The spelling of 36129221 in words is "thirty-six million, one hundred twenty-nine thousand, two hundred twenty-one".