21305272190 has 8 divisors (see below), whose sum is σ = 38349489960. Its totient is φ = 8522108872.

The previous prime is 21305272187. The next prime is 21305272207. The reversal of 21305272190 is 9127250312.

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

It is a super-3 number, since 3×21305272190³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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, 1065263600 + ... + 1065263619.

It is an arithmetic number, because the mean of its divisors is an integer number (4793686245).

Almost surely, 2^21305272190 is an apocalyptic number.

21305272190 is a deficient number, since it is larger than the sum of its proper divisors (17044217770).

21305272190 is a wasteful number, since it uses less digits than its factorization.

21305272190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2130527226.

The product of its (nonzero) digits is 7560, while the sum is 32.

The spelling of 21305272190 in words is "twenty-one billion, three hundred five million, two hundred seventy-two thousand, one hundred ninety".