21012210434 has 8 divisors (see below), whose sum is σ = 31518974460. Its totient is φ = 10505885616.

The previous prime is 21012210431. The next prime is 21012210467. The reversal of 21012210434 is 43401221012.

It can be written as a sum of positive squares in 2 ways, for example, as 19797897025 + 1214313409 = 140705^2 + 34847^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21012210431) 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, 66272 + ... + 215444.

Almost surely, 2^21012210434 is an apocalyptic number.

21012210434 is a deficient number, since it is larger than the sum of its proper divisors (10506764026).

21012210434 is a wasteful number, since it uses less digits than its factorization.

21012210434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219604.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21012210434 its reverse (43401221012), we get a palindrome (64413431446).

The spelling of 21012210434 in words is "twenty-one billion, twelve million, two hundred ten thousand, four hundred thirty-four".