21530423504026 has 16 divisors (see below), whose sum is σ = 33083622452160. Its totient is φ = 10502553937120.

The previous prime is 21530423503991. The next prime is 21530423504077. The reversal of 21530423504026 is 62040532403512.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8832195 + ... + 11003113.

It is an arithmetic number, because the mean of its divisors is an integer number (2067726403260).

Almost surely, 2^{21530423504026} is an apocalyptic number.

21530423504026 is a deficient number, since it is larger than the sum of its proper divisors (11553198948134).

21530423504026 is a wasteful number, since it uses less digits than its factorization.

21530423504026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2291909.

The product of its (nonzero) digits is 172800, while the sum is 37.

Adding to 21530423504026 its reverse (62040532403512), we get a palindrome (83570955907538).

The spelling of 21530423504026 in words is "twenty-one trillion, five hundred thirty billion, four hundred twenty-three million, five hundred four thousand, twenty-six".