21792920234 has 4 divisors (see below), whose sum is σ = 32689380354. Its totient is φ = 10896460116.

The previous prime is 21792920197. The next prime is 21792920263. The reversal of 21792920234 is 43202929712.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 14702775025 + 7090145209 = 121255^2 + 84203^2 .

It is a super-2 number, since 2×21792920234² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21792920191 and 21792920200.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5448230057 + ... + 5448230060.

Almost surely, 2^21792920234 is an apocalyptic number.

21792920234 is a deficient number, since it is larger than the sum of its proper divisors (10896460120).

21792920234 is a wasteful number, since it uses less digits than its factorization.

21792920234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10896460119.

The product of its (nonzero) digits is 108864, while the sum is 41.

The spelling of 21792920234 in words is "twenty-one billion, seven hundred ninety-two million, nine hundred twenty thousand, two hundred thirty-four".