21270434361 has 16 divisors (see below), whose sum is σ = 31032300288. Its totient is φ = 12852219600.

The previous prime is 21270434359. The next prime is 21270434377. The reversal of 21270434361 is 16343407212.

It is not a de Polignac number, because 21270434361 - 2¹ = 21270434359 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (21270436361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 962731 + ... + 984576.

It is an arithmetic number, because the mean of its divisors is an integer number (1939518768).

Almost surely, 2^21270434361 is an apocalyptic number.

It is an amenable number.

21270434361 is a deficient number, since it is larger than the sum of its proper divisors (9761865927).

21270434361 is a wasteful number, since it uses less digits than its factorization.

21270434361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1947652.

The product of its (nonzero) digits is 24192, while the sum is 33.

The spelling of 21270434361 in words is "twenty-one billion, two hundred seventy million, four hundred thirty-four thousand, three hundred sixty-one".