21898132085 has 8 divisors (see below), whose sum is σ = 26292279456. Its totient is φ = 17508825040.

The previous prime is 21898132063. The next prime is 21898132121. The reversal of 21898132085 is 58023189812.

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

It is not a de Polignac number, because 21898132085 - 2¹⁰ = 21898131061 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 1200119 + ... + 1218228.

It is an arithmetic number, because the mean of its divisors is an integer number (3286534932).

Almost surely, 2^21898132085 is an apocalyptic number.

It is an amenable number.

21898132085 is a deficient number, since it is larger than the sum of its proper divisors (4394147371).

21898132085 is a wasteful number, since it uses less digits than its factorization.

21898132085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2420163.

The product of its (nonzero) digits is 276480, while the sum is 47.

The spelling of 21898132085 in words is "twenty-one billion, eight hundred ninety-eight million, one hundred thirty-two thousand, eighty-five".