21270502434 has 16 divisors (see below), whose sum is σ = 42962204160. Its totient is φ = 7019967600.

The previous prime is 21270502427. The next prime is 21270502439. The reversal of 21270502434 is 43420507212.

It is not an unprimeable number, because it can be changed into a prime (21270502439) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17549314 + ... + 17550525.

It is an arithmetic number, because the mean of its divisors is an integer number (2685137760).

Almost surely, 2^21270502434 is an apocalyptic number.

21270502434 is an abundant number, since it is smaller than the sum of its proper divisors (21691701726).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21270502434 is a wasteful number, since it uses less digits than its factorization.

21270502434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35099945.

The product of its (nonzero) digits is 13440, while the sum is 30.

The spelling of 21270502434 in words is "twenty-one billion, two hundred seventy million, five hundred two thousand, four hundred thirty-four".