21530217194 has 32 divisors (see below), whose sum is σ = 35274025920. Its totient is φ = 9820528128.

The previous prime is 21530217173. The next prime is 21530217221. The reversal of 21530217194 is 49171203512.

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, 57449 + ... + 215315.

It is an arithmetic number, because the mean of its divisors is an integer number (1102313310).

Almost surely, 2^21530217194 is an apocalyptic number.

21530217194 is a deficient number, since it is larger than the sum of its proper divisors (13743808726).

21530217194 is a wasteful number, since it uses less digits than its factorization.

21530217194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158022.

The product of its (nonzero) digits is 15120, while the sum is 35.

The spelling of 21530217194 in words is "twenty-one billion, five hundred thirty million, two hundred seventeen thousand, one hundred ninety-four".