21106206234 has 32 divisors (see below), whose sum is σ = 46923624000. Its totient is φ = 7032260592.

The previous prime is 21106206227. The next prime is 21106206257. The reversal of 21106206234 is 43260260112.

21106206234 is a `hidden beast` number, since 2 + 1 + 1 + 0 + 620 + 6 + 2 + 34 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 21106206198 and 21106206207.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36397 + ... + 208655.

It is an arithmetic number, because the mean of its divisors is an integer number (1466363250).

Almost surely, 2^21106206234 is an apocalyptic number.

21106206234 is an abundant number, since it is smaller than the sum of its proper divisors (25817417766).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21106206234 is a wasteful number, since it uses less digits than its factorization.

21106206234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174539 (or 174533 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

Adding to 21106206234 its reverse (43260260112), we get a palindrome (64366466346).

The spelling of 21106206234 in words is "twenty-one billion, one hundred six million, two hundred six thousand, two hundred thirty-four".