215210004040 has 16 divisors (see below), whose sum is σ = 484222509180. Its totient is φ = 86084001600.

The previous prime is 215210003993. The next prime is 215210004041. The reversal of 215210004040 is 40400012512.

It can be written as a sum of positive squares in 2 ways, for example, as 212995172196 + 2214831844 = 461514^2 + 47062^2 .

It is a junction number, because it is equal to n+sod(n) for n = 215210003999 and 215210004017.

It is not an unprimeable number, because it can be changed into a prime (215210004041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2690125011 + ... + 2690125090.

Almost surely, 2^215210004040 is an apocalyptic number.

215210004040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215210004040 is an abundant number, since it is smaller than the sum of its proper divisors (269012505140).

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

215210004040 is a wasteful number, since it uses less digits than its factorization.

215210004040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5380250112 (or 5380250108 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

Adding to 215210004040 its reverse (40400012512), we get a palindrome (255610016552).

The spelling of 215210004040 in words is "two hundred fifteen billion, two hundred ten million, four thousand, forty".