21220210332320 has 24 divisors (see below), whose sum is σ = 50132746910484. Its totient is φ = 8488084132864.

The previous prime is 21220210332289. The next prime is 21220210332337. The reversal of 21220210332320 is 2323301202212.

It can be written as a sum of positive squares in 2 ways, for example, as 20947354541584 + 272855790736 = 4576828^2 + 522356^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66313157129 + ... + 66313157448.

Almost surely, 2^{21220210332320} is an apocalyptic number.

21220210332320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21220210332320 is an abundant number, since it is smaller than the sum of its proper divisors (28912536578164).

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

21220210332320 is a wasteful number, since it uses less digits than its factorization.

21220210332320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132626314592 (or 132626314584 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 21220210332320 its reverse (2323301202212), we get a palindrome (23543511534532).

The spelling of 21220210332320 in words is "twenty-one trillion, two hundred twenty billion, two hundred ten million, three hundred thirty-two thousand, three hundred twenty".