21056003562 has 32 divisors (see below), whose sum is σ = 46137574080. Its totient is φ = 6353217920.

The previous prime is 21056003561. The next prime is 21056003567. The reversal of 21056003562 is 26530065012.

It is not an unprimeable number, because it can be changed into a prime (21056003561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 669237 + ... + 699992.

It is an arithmetic number, because the mean of its divisors is an integer number (1441799190).

Almost surely, 2^21056003562 is an apocalyptic number.

21056003562 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21056003562 is an abundant number, since it is smaller than the sum of its proper divisors (25081570518).

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

21056003562 is a wasteful number, since it uses less digits than its factorization.

21056003562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1369478.

The product of its (nonzero) digits is 10800, while the sum is 30.

Adding to 21056003562 its reverse (26530065012), we get a palindrome (47586068574).

The spelling of 21056003562 in words is "twenty-one billion, fifty-six million, three thousand, five hundred sixty-two".