21272945830 has 8 divisors (see below), whose sum is σ = 38291302512. Its totient is φ = 8509178328.

The previous prime is 21272945821. The next prime is 21272945831. The reversal of 21272945830 is 3854927212.

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

It is a super-2 number, since 2×21272945830² (a number of 21 digits) contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21272945831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1063647282 + ... + 1063647301.

It is an arithmetic number, because the mean of its divisors is an integer number (4786412814).

Almost surely, 2^21272945830 is an apocalyptic number.

21272945830 is a deficient number, since it is larger than the sum of its proper divisors (17018356682).

21272945830 is a wasteful number, since it uses less digits than its factorization.

21272945830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2127294590.

The product of its (nonzero) digits is 241920, while the sum is 43.

The spelling of 21272945830 in words is "twenty-one billion, two hundred seventy-two million, nine hundred forty-five thousand, eight hundred thirty".