40621521 has 8 divisors (see below), whose sum is σ = 54205120. Its totient is φ = 27059472.

The previous prime is 40621463. The next prime is 40621549. The reversal of 40621521 is 12512604.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40621521 - 2¹⁷ = 40490449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40621571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 301 + ... + 9018.

It is an arithmetic number, because the mean of its divisors is an integer number (6775640).

Almost surely, 2^40621521 is an apocalyptic number.

It is an amenable number.

40621521 is a deficient number, since it is larger than the sum of its proper divisors (13583599).

40621521 is a wasteful number, since it uses less digits than its factorization.

40621521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10775.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 40621521 is about 6373.5014709342. The cubic root of 40621521 is about 343.7574034328.

It can be divided in two parts, 406215 and 21, that multiplied together give a triangular number (8530515 = T₄₁₃₀).

The spelling of 40621521 in words is "forty million, six hundred twenty-one thousand, five hundred twenty-one".