40021553 has 32 divisors (see below), whose sum is σ = 50585472. Its totient is φ = 31104000.

The previous prime is 40021547. The next prime is 40021561. The reversal of 40021553 is 35512004.

It is a cyclic number.

It is not a de Polignac number, because 40021553 - 2⁶ = 40021489 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40021573) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 245450 + ... + 245612.

It is an arithmetic number, because the mean of its divisors is an integer number (1580796).

Almost surely, 2^40021553 is an apocalyptic number.

It is an amenable number.

40021553 is a deficient number, since it is larger than the sum of its proper divisors (10563919).

40021553 is a wasteful number, since it uses less digits than its factorization.

40021553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 40021553 is about 6326.2590051309. The cubic root of 40021553 is about 342.0566034921.

Adding to 40021553 its reverse (35512004), we get a palindrome (75533557).

It can be divided in two parts, 4002 and 1553, that added together give a palindrome (5555).

The spelling of 40021553 in words is "forty million, twenty-one thousand, five hundred fifty-three".