40921213 has 4 divisors (see below), whose sum is σ = 41050620. Its totient is φ = 40791808.

The previous prime is 40921207. The next prime is 40921217. The reversal of 40921213 is 31212904.

40921213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5184729 + 35736484 = 2277^2 + 5978^2 .

It is a cyclic number.

It is not a de Polignac number, because 40921213 - 2⁹ = 40920701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40921217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64228 + ... + 64861.

It is an arithmetic number, because the mean of its divisors is an integer number (10262655).

Almost surely, 2^40921213 is an apocalyptic number.

It is an amenable number.

40921213 is a deficient number, since it is larger than the sum of its proper divisors (129407).

40921213 is a wasteful number, since it uses less digits than its factorization.

40921213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129406.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 40921213 is about 6396.9690479164. The cubic root of 40921213 is about 344.6007086744.

The spelling of 40921213 in words is "forty million, nine hundred twenty-one thousand, two hundred thirteen".