215621211140542 has 8 divisors (see below), whose sum is σ = 342457217693856. Its totient is φ = 101468805242592.

The previous prime is 215621211140497. The next prime is 215621211140557. The reversal of 215621211140542 is 245041112126512.

It is a happy number.

215621211140542 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3170900163798 + ... + 3170900163865.

It is an arithmetic number, because the mean of its divisors is an integer number (42807152211732).

Almost surely, 2^{215621211140542} is an apocalyptic number.

215621211140542 is a deficient number, since it is larger than the sum of its proper divisors (126836006553314).

215621211140542 is a wasteful number, since it uses less digits than its factorization.

215621211140542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6341800327682.

The product of its (nonzero) digits is 38400, while the sum is 37.

The spelling of 215621211140542 in words is "two hundred fifteen trillion, six hundred twenty-one billion, two hundred eleven million, one hundred forty thousand, five hundred forty-two".