21012864226 has 16 divisors (see below), whose sum is σ = 31663094400. Its totient is φ = 10458533008.

The previous prime is 21012864221. The next prime is 21012864233. The reversal of 21012864226 is 62246821012.

It is a junction number, because it is equal to n+sod(n) for n = 21012864191 and 21012864200.

It is not an unprimeable number, because it can be changed into a prime (21012864221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1581780 + ... + 1595008.

It is an arithmetic number, because the mean of its divisors is an integer number (1978943400).

Almost surely, 2^21012864226 is an apocalyptic number.

21012864226 is a deficient number, since it is larger than the sum of its proper divisors (10650230174).

21012864226 is a wasteful number, since it uses less digits than its factorization.

21012864226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16793.

The product of its (nonzero) digits is 18432, while the sum is 34.

The spelling of 21012864226 in words is "twenty-one billion, twelve million, eight hundred sixty-four thousand, two hundred twenty-six".