21225332320520 has 32 divisors (see below), whose sum is σ = 47898709911000. Its totient is φ = 8464939650048.

The previous prime is 21225332320499. The next prime is 21225332320541. The reversal of 21225332320520 is 2502323352212.

It is an interprime number because it is at equal distance from previous prime (21225332320499) and next prime (21225332320541).

It can be written as a sum of positive squares in 4 ways, for example, as 14910394514404 + 6314937806116 = 3861398^2 + 2512954^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 787276295 + ... + 787303254.

Almost surely, 2^{21225332320520} is an apocalyptic number.

21225332320520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21225332320520 is an abundant number, since it is smaller than the sum of its proper divisors (26673377590480).

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

21225332320520 is a wasteful number, since it uses less digits than its factorization.

21225332320520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1574579897 (or 1574579893 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 32.

Adding to 21225332320520 its reverse (2502323352212), we get a palindrome (23727655672732).

The spelling of 21225332320520 in words is "twenty-one trillion, two hundred twenty-five billion, three hundred thirty-two million, three hundred twenty thousand, five hundred twenty".