21110301220 has 12 divisors (see below), whose sum is σ = 44331632604. Its totient is φ = 8444120480.

The previous prime is 21110301193. The next prime is 21110301307. The reversal of 21110301220 is 2210301112.

It can be written as a sum of positive squares in 2 ways, for example, as 2336368896 + 18773932324 = 48336^2 + 137018^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21110301220.

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, 527757511 + ... + 527757550.

It is an arithmetic number, because the mean of its divisors is an integer number (3694302717).

Almost surely, 2^21110301220 is an apocalyptic number.

21110301220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21110301220 is an abundant number, since it is smaller than the sum of its proper divisors (23221331384).

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

21110301220 is a wasteful number, since it uses less digits than its factorization.

21110301220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1055515070 (or 1055515068 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21110301220 its reverse (2210301112), we get a palindrome (23320602332).

The spelling of 21110301220 in words is "twenty-one billion, one hundred ten million, three hundred one thousand, two hundred twenty".