36405021 has 16 divisors (see below), whose sum is σ = 51004800. Its totient is φ = 23052480.

The previous prime is 36405013. The next prime is 36405029. The reversal of 36405021 is 12050463.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (36405013) and next prime (36405029).

It is not a de Polignac number, because 36405021 - 2³ = 36405013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36405029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8511 + ... + 12051.

It is an arithmetic number, because the mean of its divisors is an integer number (3187800).

Almost surely, 2^36405021 is an apocalyptic number.

It is an amenable number.

36405021 is a deficient number, since it is larger than the sum of its proper divisors (14599779).

36405021 is a wasteful number, since it uses less digits than its factorization.

36405021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3716.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 36405021 is about 6033.6573485739. The cubic root of 36405021 is about 331.4263968046.

Adding to 36405021 its reverse (12050463), we get a palindrome (48455484).

The spelling of 36405021 in words is "thirty-six million, four hundred five thousand, twenty-one".