21641784190 has 16 divisors (see below), whose sum is σ = 41951766528. Its totient is φ = 7990812576.

The previous prime is 21641784179. The next prime is 21641784217. The reversal of 21641784190 is 9148714612.

It is a super-2 number, since 2×21641784190² (a number of 21 digits) contains 22 as substring.

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, 83237502 + ... + 83237761.

It is an arithmetic number, because the mean of its divisors is an integer number (2621985408).

Almost surely, 2^21641784190 is an apocalyptic number.

21641784190 is a deficient number, since it is larger than the sum of its proper divisors (20309982338).

21641784190 is a wasteful number, since it uses less digits than its factorization.

21641784190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166475283.

The product of its (nonzero) digits is 96768, while the sum is 43.

The spelling of 21641784190 in words is "twenty-one billion, six hundred forty-one million, seven hundred eighty-four thousand, one hundred ninety".