21270203075 has 24 divisors (see below), whose sum is σ = 29178061056. Its totient is φ = 15251348000.

The previous prime is 21270203057. The next prime is 21270203147. The reversal of 21270203075 is 57030207212.

It is not a de Polignac number, because 21270203075 - 2¹² = 21270198979 is a prime.

It is a Duffinian 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 23 ways as a sum of consecutive naturals, for example, 525167 + ... + 564216.

It is an arithmetic number, because the mean of its divisors is an integer number (1215752544).

Almost surely, 2^21270203075 is an apocalyptic number.

21270203075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21270203075 is a deficient number, since it is larger than the sum of its proper divisors (7907857981).

21270203075 is a wasteful number, since it uses less digits than its factorization.

21270203075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1089475 (or 1089470 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 29.

The spelling of 21270203075 in words is "twenty-one billion, two hundred seventy million, two hundred three thousand, seventy-five".