21302341220 has 24 divisors (see below), whose sum is σ = 44753836344. Its totient is φ = 8517332736.

The previous prime is 21302341211. The next prime is 21302341267. The reversal of 21302341220 is 2214320312.

It can be written as a sum of positive squares in 4 ways, for example, as 4491144256 + 16811196964 = 67016^2 + 129658^2 .

It is a super-2 number, since 2×21302341220² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 21302341192 and 21302341201.

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, 176507 + ... + 271586.

It is an arithmetic number, because the mean of its divisors is an integer number (1864743181).

Almost surely, 2^21302341220 is an apocalyptic number.

21302341220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21302341220 is an abundant number, since it is smaller than the sum of its proper divisors (23451495124).

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

21302341220 is a wasteful number, since it uses less digits than its factorization.

21302341220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450479 (or 450477 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21302341220 its reverse (2214320312), we get a palindrome (23516661532).

The spelling of 21302341220 in words is "twenty-one billion, three hundred two million, three hundred forty-one thousand, two hundred twenty".