21270505425 has 96 divisors (see below), whose sum is σ = 39010836480. Its totient is φ = 10158566400.

The previous prime is 21270505411. The next prime is 21270505429. The reversal of 21270505425 is 52450507212.

It is not a de Polignac number, because 21270505425 - 2⁷ = 21270505297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21270505429) 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 95 ways as a sum of consecutive naturals, for example, 16629936 + ... + 16631214.

It is an arithmetic number, because the mean of its divisors is an integer number (406362880).

Almost surely, 2^21270505425 is an apocalyptic number.

21270505425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21270505425 is a deficient number, since it is larger than the sum of its proper divisors (17740331055).

21270505425 is a wasteful number, since it uses less digits than its factorization.

21270505425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1803 (or 1798 counting only the distinct ones).

The product of its (nonzero) digits is 28000, while the sum is 33.

The spelling of 21270505425 in words is "twenty-one billion, two hundred seventy million, five hundred five thousand, four hundred twenty-five".