21081752234 has 8 divisors (see below), whose sum is σ = 31636547460. Its totient is φ = 10536236416.

The previous prime is 21081752231. The next prime is 21081752249. The reversal of 21081752234 is 43225718012.

It can be written as a sum of positive squares in 2 ways, for example, as 20035553209 + 1046199025 = 141547^2 + 32345^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 21081752194 and 21081752203.

It is not an unprimeable number, because it can be changed into a prime (21081752231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2314169 + ... + 2323260.

Almost surely, 2^21081752234 is an apocalyptic number.

21081752234 is a deficient number, since it is larger than the sum of its proper divisors (10554795226).

21081752234 is a wasteful number, since it uses less digits than its factorization.

21081752234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4639704.

The product of its (nonzero) digits is 26880, while the sum is 35.

The spelling of 21081752234 in words is "twenty-one billion, eighty-one million, seven hundred fifty-two thousand, two hundred thirty-four".