215100450242 has 4 divisors (see below), whose sum is σ = 322650675366. Its totient is φ = 107550225120.

The previous prime is 215100450241. The next prime is 215100450281. The reversal of 215100450242 is 242054001512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 211525486561 + 3574963681 = 459919^2 + 59791^2 .

It is a super-2 number, since 2×215100450242² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (215100450241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53775112559 + ... + 53775112562.

Almost surely, 2^215100450242 is an apocalyptic number.

215100450242 is a deficient number, since it is larger than the sum of its proper divisors (107550225124).

215100450242 is a wasteful number, since it uses less digits than its factorization.

215100450242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107550225123.

The product of its (nonzero) digits is 3200, while the sum is 26.

Adding to 215100450242 its reverse (242054001512), we get a palindrome (457154451754).

The spelling of 215100450242 in words is "two hundred fifteen billion, one hundred million, four hundred fifty thousand, two hundred forty-two".