21945219190 has 8 divisors (see below), whose sum is σ = 39501394560. Its totient is φ = 8778087672.

The previous prime is 21945219161. The next prime is 21945219211. The reversal of 21945219190 is 9191254912.

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

It is a super-2 number, since 2×21945219190² (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 3 ways as a sum of consecutive naturals, for example, 1097260950 + ... + 1097260969.

It is an arithmetic number, because the mean of its divisors is an integer number (4937674320).

Almost surely, 2^21945219190 is an apocalyptic number.

21945219190 is a deficient number, since it is larger than the sum of its proper divisors (17556175370).

21945219190 is a wasteful number, since it uses less digits than its factorization.

21945219190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2194521926.

The product of its (nonzero) digits is 58320, while the sum is 43.

The spelling of 21945219190 in words is "twenty-one billion, nine hundred forty-five million, two hundred nineteen thousand, one hundred ninety".