21047434226 has 128 divisors (see below), whose sum is σ = 41489280000. Its totient is φ = 7946975232.

The previous prime is 21047434217. The next prime is 21047434237. The reversal of 21047434226 is 62243474012.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 25085915 + ... + 25086753.

It is an arithmetic number, because the mean of its divisors is an integer number (324135000).

Almost surely, 2^21047434226 is an apocalyptic number.

21047434226 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21047434226 is a deficient number, since it is larger than the sum of its proper divisors (20441845774).

21047434226 is a wasteful number, since it uses less digits than its factorization.

21047434226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1001 (or 987 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 35.

The spelling of 21047434226 in words is "twenty-one billion, forty-seven million, four hundred thirty-four thousand, two hundred twenty-six".