213145513221505 has 16 divisors (see below), whose sum is σ = 269237196622080. Its totient is φ = 161541407331072.

The previous prime is 213145513221497. The next prime is 213145513221517. The reversal of 213145513221505 is 505122315541312.

It is a cyclic number.

It is not a de Polignac number, because 213145513221505 - 2³ = 213145513221497 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32869912 + ... + 38816518.

It is an arithmetic number, because the mean of its divisors is an integer number (16827324788880).

Almost surely, 2^{213145513221505} is an apocalyptic number.

It is an amenable number.

213145513221505 is a deficient number, since it is larger than the sum of its proper divisors (56091683400575).

213145513221505 is a wasteful number, since it uses less digits than its factorization.

213145513221505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6323928.

The product of its (nonzero) digits is 180000, while the sum is 40.

Adding to 213145513221505 its reverse (505122315541312), we get a palindrome (718267828762817).

The spelling of 213145513221505 in words is "two hundred thirteen trillion, one hundred forty-five billion, five hundred thirteen million, two hundred twenty-one thousand, five hundred five".