405440021010 has 64 divisors (see below), whose sum is σ = 976976328960. Its totient is φ = 107682504960.

The previous prime is 405440021009. The next prime is 405440021011. The reversal of 405440021010 is 10120044504.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (405440021009) and next prime (405440021011).

It is a super-2 number, since 2×405440021010² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (405440021011) 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, 8819244 + ... + 8865096.

It is an arithmetic number, because the mean of its divisors is an integer number (15265255140).

Almost surely, 2^405440021010 is an apocalyptic number.

405440021010 is an abundant number, since it is smaller than the sum of its proper divisors (571536307950).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

405440021010 is a wasteful number, since it uses less digits than its factorization.

405440021010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47043.

The product of its (nonzero) digits is 640, while the sum is 21.

Adding to 405440021010 its reverse (10120044504), we get a palindrome (415560065514).

The spelling of 405440021010 in words is "four hundred five billion, four hundred forty million, twenty-one thousand, ten".