21270712550 has 12 divisors (see below), whose sum is σ = 39563525436. Its totient is φ = 8508285000.

The previous prime is 21270712523. The next prime is 21270712601. The reversal of 21270712550 is 5521707212.

It is a congruent number.

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 5 ways as a sum of consecutive naturals, for example, 212707076 + ... + 212707175.

It is an arithmetic number, because the mean of its divisors is an integer number (3296960453).

Almost surely, 2^21270712550 is an apocalyptic number.

21270712550 is a deficient number, since it is larger than the sum of its proper divisors (18292812886).

21270712550 is a wasteful number, since it uses less digits than its factorization.

21270712550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425414263 (or 425414258 counting only the distinct ones).

The product of its (nonzero) digits is 9800, while the sum is 32.

The spelling of 21270712550 in words is "twenty-one billion, two hundred seventy million, seven hundred twelve thousand, five hundred fifty".