36140021 has 2 divisors, whose sum is σ = 36140022. Its totient is φ = 36140020.

The previous prime is 36139993. The next prime is 36140023. The reversal of 36140021 is 12004163.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23280625 + 12859396 = 4825^2 + 3586^2 .

It is an emirp because it is prime and its reverse (12004163) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-36140021 is a prime.

It is a super-2 number, since 2×36140021² = 2612202235760882, which contains 22 as substring.

Together with 36140023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36140023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18070010 + 18070011.

It is an arithmetic number, because the mean of its divisors is an integer number (18070011).

Almost surely, 2^36140021 is an apocalyptic number.

It is an amenable number.

36140021 is a deficient number, since it is larger than the sum of its proper divisors (1).

36140021 is an equidigital number, since it uses as much as digits as its factorization.

36140021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 36140021 is about 6011.6570926825. The cubic root of 36140021 is about 330.6202628791.

Adding to 36140021 its reverse (12004163), we get a palindrome (48144184).

The spelling of 36140021 in words is "thirty-six million, one hundred forty thousand, twenty-one".