35721421 has 2 divisors, whose sum is σ = 35721422. Its totient is φ = 35721420.

The previous prime is 35721407. The next prime is 35721431. The reversal of 35721421 is 12412753.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28355625 + 7365796 = 5325^2 + 2714^2 .

It is an emirp because it is prime and its reverse (12412753) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 35721421 - 2¹⁷ = 35590349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (35721431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17860710 + 17860711.

It is an arithmetic number, because the mean of its divisors is an integer number (17860711).

Almost surely, 2^35721421 is an apocalyptic number.

It is an amenable number.

35721421 is a deficient number, since it is larger than the sum of its proper divisors (1).

35721421 is an equidigital number, since it uses as much as digits as its factorization.

35721421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1680, while the sum is 25.

The square root of 35721421 is about 5976.7399976910. The cubic root of 35721421 is about 329.3388077306.

The spelling of 35721421 in words is "thirty-five million, seven hundred twenty-one thousand, four hundred twenty-one".