40020212421 has 18 divisors (see below), whose sum is σ = 67244847462. Its totient is φ = 22868692560.

The previous prime is 40020212413. The next prime is 40020212423. The reversal of 40020212421 is 12421202004.

40020212421 is a `hidden beast` number, since 40 + 0 + 202 + 1 + 2 + 421 = 666.

It can be written as a sum of positive squares in only one way, i.e., 34415444196 + 5604768225 = 185514^2 + 74865^2 .

It is not a de Polignac number, because 40020212421 - 2³ = 40020212413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40020212394 and 40020212403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40020212423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 45373950 + ... + 45374831.

It is an arithmetic number, because the mean of its divisors is an integer number (3735824859).

Almost surely, 2^40020212421 is an apocalyptic number.

It is an amenable number.

40020212421 is a deficient number, since it is larger than the sum of its proper divisors (27224635041).

40020212421 is a wasteful number, since it uses less digits than its factorization.

40020212421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90748801 (or 90748791 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 40020212421 its reverse (12421202004), we get a palindrome (52441414425).

The spelling of 40020212421 in words is "forty billion, twenty million, two hundred twelve thousand, four hundred twenty-one".