21520442523000 has 64 divisors (see below), whose sum is σ = 67143780681120. Its totient is φ = 5738784672000.

The previous prime is 21520442522963. The next prime is 21520442523029. The reversal of 21520442523000 is 32524402512.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3586737421 + ... + 3586743420.

Almost surely, 2^{21520442523000} is an apocalyptic number.

21520442523000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21520442523000 is an abundant number, since it is smaller than the sum of its proper divisors (45623338158120).

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

21520442523000 is a wasteful number, since it uses less digits than its factorization.

21520442523000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7173480865 (or 7173480851 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

Adding to 21520442523000 its reverse (32524402512), we get a palindrome (21552966925512).

The spelling of 21520442523000 in words is "twenty-one trillion, five hundred twenty billion, four hundred forty-two million, five hundred twenty-three thousand".