215020105638 has 16 divisors (see below), whose sum is σ = 463120227696. Its totient is φ = 66160032480.

The previous prime is 215020105613. The next prime is 215020105649. The reversal of 215020105638 is 836501020512.

It is a junction number, because it is equal to n+sod(n) for n = 215020105599 and 215020105608.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1378333933 + ... + 1378334088.

It is an arithmetic number, because the mean of its divisors is an integer number (28945014231).

Almost surely, 2^215020105638 is an apocalyptic number.

215020105638 is an abundant number, since it is smaller than the sum of its proper divisors (248100122058).

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

215020105638 is a wasteful number, since it uses less digits than its factorization.

215020105638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2756668039.

The product of its (nonzero) digits is 14400, while the sum is 33.

The spelling of 215020105638 in words is "two hundred fifteen billion, twenty million, one hundred five thousand, six hundred thirty-eight".