405072421210 has 16 divisors (see below), whose sum is σ = 729137685096. Its totient is φ = 162027340288.

The previous prime is 405072421181. The next prime is 405072421219. The reversal of 405072421210 is 12124270504.

It is a Cunningham number, because it is equal to 636453²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 380181994921 + 24890426289 = 616589^2 + 157767^2 .

It is not an unprimeable number, because it can be changed into a prime (405072421219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1615842 + ... + 1849618.

Almost surely, 2^405072421210 is an apocalyptic number.

405072421210 is a deficient number, since it is larger than the sum of its proper divisors (324065263886).

405072421210 is a wasteful number, since it uses less digits than its factorization.

405072421210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407057.

The product of its (nonzero) digits is 4480, while the sum is 28.

Adding to 405072421210 its reverse (12124270504), we get a palindrome (417196691714).

The spelling of 405072421210 in words is "four hundred five billion, seventy-two million, four hundred twenty-one thousand, two hundred ten".