215405213642 has 16 divisors (see below), whose sum is σ = 330654470112. Its totient is φ = 105204961680.

The previous prime is 215405213609. The next prime is 215405213701. The reversal of 215405213642 is 246312504512.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4451984 + ... + 4500107.

It is an arithmetic number, because the mean of its divisors is an integer number (20665904382).

Almost surely, 2^215405213642 is an apocalyptic number.

215405213642 is a deficient number, since it is larger than the sum of its proper divisors (115249256470).

215405213642 is a wasteful number, since it uses less digits than its factorization.

215405213642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8952373.

The product of its (nonzero) digits is 57600, while the sum is 35.

The spelling of 215405213642 in words is "two hundred fifteen billion, four hundred five million, two hundred thirteen thousand, six hundred forty-two".